Electronic Circuits

Monday, July 4, 2022

Automatic Programmable 4.2V Battery Charge, Current up to 500mA using LTH7R IC with PCB

Electronic Circuits Battery Charger , Circuits to Assemble

The LTH7R IC is a constant current or constant voltage base charger chip, mainly used for single cell lithium battery charging.

No external sensing resistor is needed, it has its internal power MOSFET structure, so no external reverse diode is needed.

The LTH7R IC has under temperature protection and control, it adjusts the charging current automatically to limit high temperature on the chip.

Its charging voltage is fixed at 4.2V, and the charging current can be adjusted by an external resistor.

When the float voltage is reached and the charging current drops to 1/10 of the defined circuit, the LTH7R IC automatically completes the charging process.

When the input source voltage is removed, the LTH7R IC automatically enters low current mode, drawing less than 2uA from the battery.

You may be interested in:

When the LTH7R IC enters standby mode, the supply current is less than 25uA. The LTH7R IC can also monitor charging current, has the features of voltage detection, auto-cycle charging, and has an indicator pin to indicate end-of-charge status and input voltage status.

Features

Programmable charging current up to 500mA
No need for external MOSFET, sensing resistor, reverse diode
Constant current or constant voltage mode operation, with thermal protection function Preset charging voltage
Standby current is 20uA
2.9V slow charge voltage
Soft start limits the inrush current
Adopt SOT23-5 package, application line

Product application

Microphone Battery
Light Camera
Mobile Phones, PDAs, MP3 players
Bluetooth headsets

External programming of the load current:

PROG (pin 5): Constant current load current setting and load current monitoring terminal. The load current can be programmed by connecting an external resistor from the PROG pin to ground.

In the pre-charge phase, the voltage of this pin is modulated by 0.1V; in the constant current charging stage, the voltage of this pin is fixed at 1V.

In all charging state modes, measuring the voltage of this pin can estimate the charging current according to the following formula:

General Formula:

I_bat = 1000 / R_prog

To use, for example, in a charger whose required current is 300mA, we can use the formula as follows:

I_bat = 1000/ R_prog
R_prog = 1000 / I_bat
R_prog = 1000 / 300
R_Prog = 3.3K

To use, for example, in a charger whose current required is the maximum current, 500mA, we can use the formula as follows:

I_bat = 1000/ R_prog
R_prog = 1000 / I_bat
R_prog = 1000 / 500
R_Prog = 2K

We leave just below a small table ready with five models with the standard currents for the battery charger.

Model	R_prog	I_bat
1	10K	100mA
2	5K	200mA
3	3,3K	300mA
4	2,5K	400mA
5	2K	500mA

The Circuit Schematic

In Figure 2, below, we can see the schematic diagram of the Automatic Programmable 4.2V Battery Charge, Current up to 500mA using LTH7R IC.

All circuit components are SMD, the power supply input is done by soldering on the PCB. This type of miniaturized SMD circuit is great to be implemented in circuits with small spaces.

The capacitors are SMD electrolytic, but if you have tantalum capacitors, you can put them on, it will help with the plate height, but if you can't find them, you can use electrolytic.

The charger circuit supports voltage between 4.4V to 7V, the recommended is 5V, which is great news for us to be able to charge our battery in a PC USB port or even with cell phone chargers.

Fig. 3 - Automatic Programmable 4.2V Battery Charge, Current up to 500mA using TH7R IC

Printed Circuit Board

In Figure 3, we provide the PCB - Printed Circuit Board, in GERBER, PDF and PNG files. These files are available for free download, on the MEGA server, in a direct link, without any bypass.

All to make it easier for you to do a more optimized assembly, either at home, or with a company that prints the board. You can download the files in the Download option below.

Fig. 4 - PCB Automatic Programmable 4.2V Battery Charge, Current up to 500mA using TH7R IC

Files to download, Direct Link:

Click on the link beside: GERBER, PDF and PNG files

If you have any questions, suggestions or corrections, please leave them in the comments, and we will answer them soon.

Subscribe to our blog!!! Click Here - elcircuits.com!!!

My Best Regards!!!

5A, 1.22V to 26V, 500kHz Step-Down Converter Using RT8289 IC with PCB

Electronic Circuits Circuits to Assemble , Electronic Circuits

Fig. 1 - 5A, 1.22V to 26V, 500kHz Step-Down Converter Using RT8289 IC with PCB

This is a DC-DC 5A, 1.22V to 26V, 500kHz Step-Down Converter Using RT8289 IC, it works with a Step-Down conversion system.

This powerful chip manages to work with very few external components and provides a preset voltage between 1.22V to 26V, with 5 Amps of output current.

General IC Description

The RT8289 is a step-down regulator with an internal Power MOSFET. It achieves 5A of continuous output current over a wide input supply range with excellent load and line regulation.

Current mode operation provides fast transient response and eases loop stabilization. The RT8289 provides protections such as cycle-by-cycle current limiting and thermal shutdown.

In shutdown mode, the regulator draws 25A of supply current. The RT8289 requires a minimum number of external components, to provide a compact solution. The RT8289 is available in a SOP-8 (Exposed Pad) package.

Features

High Output Current up to 5A
Internal Soft-Start
100mΩ Internal Power MOSFET Switch
Internal Compensation Minimizes External Parts Count
High Efficiency up to 90%
25μA Shutdown Current
Fixed 500kHz Frequency
Thermal Shutdown Protection
Cycle-by-Cycle Over Current Protection
Wide 5.5V to 32V Operating Input Range
Adjustable Output Voltage from 1.222V to 26V
Available in an SOP-8 (Exposed Pad) Package
RoHS Compliant and Halogen Free

Output Voltage Setting

To define the output voltage, we use a voltage divider formed by 2 resistors, R1 and R2, this allows the FB pin of the integrated circuit to detect changes in the output voltage, and recalibrate the circuit keeping it stabilized.

To set this output voltage, we can calculate the external resistive divider, according to the equation formulated below:

VOUT = VREF *(1 + (R1/R2))

Where VREF is the reference voltage (type 1.222V).
Where R1 = 10kΩ.

We exemplify in our circuit, the voltage divider is formed by R1 and R2.

General Formula:

VOUT = VREF *(1 + R1/R2)
Where VREF is the reference voltage (type 1.222V).
Where R1 = 10kΩ.

For a 3.3V output, our formula would look like:

Vout = 1,222 * (1+ (10/5.8))
Vout = 3.328V

For a 5V output, our formula would look like:

Vout = 1,222 * (1+ (10/3.16))
Vout = 5,089V

For a 9V output, our formula would look like:

Vout = 1,222 * (1+ (10/1.57))
Vout = 9,005V

For a 12V output, our formula would look like:

Vout = 1,222 * (1+ (10/1.13))
Vout = 12,036V

For a 26V output, our formula would look like:

Vout = 1,222 * (1+ (10/0.493))
Vout = 26,009V

We may be using a trimpot instead of R2, this allows you to vary the output voltage through the Trimpot.

The Circuit Schematic

In Figure 2, below, we can see the schematic diagram of the Low Noise and High Frequency 5A DC-DC Step-Down Converter.

All circuit components are SMD, except the terminal blocks, “optional”, you can solder directly to the board. This type of SMD circuit is great to be implemented in miniaturized circuits.

It is preferable to use tantalum capacitors, but if you cannot find them, electrolytic capacitors can be used, but for more sensitive circuits, we recommend using tantalum.

The DC-DC converter supports input from 5.5V to 32V, and at the output it maintains the preset voltage completely stabilized.

Fig. 2 - Schematic 5A, 1.22V to 26V, 500kHz Step-Down Converter Using RT8289 IC

Printed Circuit Board

All to make it easier for you to do a more optimized assembly, either at home, or with a company that prints the board. You can download the files in the Download option below.

The PCB tracks are doubled, the main ones have their tracks on the bottom and top of the PCB as the current is 5 amps.

Fig. 3 - PCB 5A, 1.22V to 26V, 500kHz Step-Down Converter Using RT8289 IC

Files to download, Direct Link:

Click on the link beside: GERBER, PDF and PNG files

If you have any questions, suggestions or corrections, please leave them in the comments, and we will answer them soon.

Subscribe to our blog!!! Click Here - elcircuits.com!!!

My Best Regards!!!

Electronic Resistive Load - 50A Power Supply Test with PCB

Electronic Circuits Circuits to Assemble , Electronic Circuits

Fig. 1 - Electronic Resistive Load - 50A Power Supply Test with PCB

You know that moment when you have a power supply to fix, you do the service and the supply works, but you don't know if it will support a large load?

I came across a problem like this, and I decided to make my own resistive electronic load, and share it with our subscribers, and for you who visit us, welcome!

The circuit

The circuit is quite simple, with few components and easy to assemble, based on two power transistors Mosfet N-channel, IRL44N connected in parallel.

The circuit is capable of withstanding an initial load “for low voltage sources 4V” of 40A, and for voltage above 5V, the current is 50A, supporting voltages up to 45V.

This voltage is received and transformed into heat, and the consumption current is controlled by means of a potentiometer.

Transistor Description

Fifth Generation HEXFETs from International Rectifier utilize advanced processing techniques to achieve the lowest possible on-resistance per silicon area.

This benefit, combined with the fast switching speed and ruggedized device design that HEXFET Power MOSFETs are well known for, provides the designer with an extremely efficient device for use in a wide variety of applications.

The TO-220 package is universally preferred for all commercial-industrial applications at power dissipation levels to approximately 50 watts.

The low thermal resistance and low package cost of the TO-220 contribute to its wide acceptance throughout the industry.

How it works

When turning on the electronic resistive load, a current passes through the Drain and Source taps, and this current flow is controlled by the Mosfet Gate.

For this control to happen properly, a stabilized voltage is needed at that point, which is done through the resistor R1, current limiting, in series with the zener diode, which stabilizes the voltage at the Gate.

This stabilized voltage ensures that the current not be variable when the input voltage undergoes some variation.

This stabilized voltage point is controlled by the potentiometer P1, which adjusts the voltage at the Gate of the Mosfet according to the required current.

It is worth remembering that the transistor used is a logic-type IRL44N Mosfet, not the well-known IRF44N.

They differ in relation to the gate voltage, as the logic-type Mosfet triggers the Gate with low Vgs voltages from 4V, and the IRF44N does not work with such low voltages, the minimum Vgs is 7V.

The Circuit

The schematic diagram of the Electronic Resistive Load - Power Supply Test!, is shown in Figure 2 below, it is a simple circuit to assemble, there are few external components to solder, however it is a circuit of great quality and stability.

Fig. 2 - Electronic Resistive Load - 50A Power Supply Test

Component List

Semiconductors

Q1, Q2 .... IRL44N Mosfet Transistor
D1 ........... 1N4731 1W Zener Diode

Resistors

R1 ........ 1.8KΩ resistor (brown, grey, red, gold)
R2 ........ 0.22Ω resistor (red, red, silver, gold)
POT1 ... 220KΩ Potentiometer

Miscellaneous

P1 .... Screw Terminal Type 5mm 2-Pin Connector
Others .... PCB, Heat Sink, tin, wires, etc.

The PCB - Files to Download

In Figure 3, we provide the PCB - Printed Circuit Board, in GERBER, PDF and PNG files. These files are available for free download, on the MEGA server, in a direct link, without any bypass.

All to make it easier for you to do a more optimized assembly, either at home, or with a company that prints the board. You can download the files in the Download option below.

Fig. 3 - PCB Electronic Resistive Load - 50A Power Supply Test

Files to download, Direct Link:

Click on the link beside: GERBER, PDF and PNG files

If you have any questions, suggestions or corrections, please leave them in the comments, and we will answer them soon.

Subscribe to our blog! Click Here - elcircuits.com!

My Best Regards!

FM Transmitter 75 to 108MHz using BA1404 IC with PCB

Electronic Circuits Circuits to Assemble , Electronic Circuits

Fig. FM Transmitter 75 to 108MHz using BA1404 IC with PCB

This is a Stereo FM Transmitter, based on the BA1404 Hi-Fi Integrated Circuit, which is a stereo FM modulator that creates composite stereo signals, with low consumption, maximum 3mA, and an operating voltage between 1.5 to 2V.

The FM modulator has carriers in the FM transmission band (75~108MHz). It develops signals composed of a MAIN signal (L+R), a SUB signal (L-R) and a pilot signal (19KHz) using 38KHz crystal oscillators.

Feature

Available in DIP18 and SOP18 packages
Low operating voltage range (1.0V ~ 2V)
Low power consumption, typically 3mA
Requires few external components

Applications

FM stereo Transmitters
Wireless Microphones
FM PLL Oscillator

ATTENTION!

For each Country, Region, State... There are Laws on broadcasting, telecommunications, audio and video transmission, etc.

Do not use telecommunications equipment without authorization from the entities responsible for transmitting Radio Frequencies.

Electronic Circuits teaches electronics applied to various segments, with the aim of improving knowledge, we do not support or take responsibility for any type of illegal operation.

For any operation with RF, we recommend looking for the competent regulatory agencies, seeking certification and/or legalization.

FM Transmitter 70MHz to 150MHz using MAX2606 IC with PCB
2.5KM FM transmitter, using transistor 2N3866 with PCB

The transmitter circuit

The schematic diagram of the FM Transmitter 75 to 108MHz using BA1404 IC, is shown in Figure 2 below, it is a simple circuit to assemble, there are few external components to solder, however it is a circuit of great quality and stability.

Fig. 2 - Diagram Schematic FM Transmitter 75 to 108MHz using BA1404 IC

The Coil

The L1 coil is a Model 750A3.5T Inductor, however, you can make your own inductor by winding 3 to 4 turns of 24 AWG copper wire, or 0.5 mm diameter copper wire, into a 5 mm diameter ferrite core.

The Antenna

The antenna can be used with a telescopic antenna purchased at electronics stores, if you don't have it, you can use approximately 30cm of rigid wire, which will work perfectly.

Component List

Semiconductors

CI1 ...... BA1404 Integrated Circuit

Resistors

R1, R2 .... 47KΩ resistor (yellow, violet, orange, gold)
R3 ........... 270Ω resistor (red, violet, brown, gold)
R4 ........... 150KΩ resistor (brown, yellow, green, gold)
R5 ........... 5.6KΩ resistor (green, blue, red, gold)
R6, R7 .... 27KΩ resistor (red, violet, orange, gold)

Capacitors

C1, C2, C6, C12, C13 .. 1nF Ceramic Capacitor
C3, C4, C5, C14 .......... 10uF 16V Electrolytic Capacitor
C7, C10 ....................... 10pF Ceramic Capacitor
C8, C9, C11 ................. 15pF Ceramic Capacitor
C15 .............................. 220pF Ceramic Capacitor

Inductor

L1 ......... 750A3.5T Inductor *see text

Cristal

CR1 ...... 38KHz Cristal

Miscellaneous

P1, P2 .... Screw Terminal Type 5mm 2-Pin Connector
ANT1 .... Telescopic Antenna *See Text
Others .... Printed Circuit Board, tin, wires, etc.

The PCB - Files to Download

All to make it easier for you to do a more optimized assembly, either at home, or with a company that prints the board. You can download the files in the Download option below.

Fig.3 - PCB FM Transmitter 75 to 108MHz using BA1404 IC

Files to download, Direct Link:

Click on the link beside: GERBER, PDF and PNG files

If you have any questions, suggestions or corrections, please leave them in the comments, and we will answer them soon.

Subscribe to our blog! Click Here - elcircuits.com!

My Best Regards!

2.5KM FM transmitter, using transistor 2N3866 with PCB

Electronic Circuits Circuits to Assemble , Electronic Circuits

Fig. 1 - 2.5KM FM transmitter, using transistor 2N3866 with PCB

This is a simple FM transmitter, with great range, being able to reach more than 2.5 km of distance, using a suitable antenna, powered by a power supply or a 12Vdc battery.

The circuit has a frequency range that can be tuned between 88 and 108 MHz, and is quite stable, and can be used for small audio transmission links, or as community radio, and with great audio quality.

The Transmitter

The FM - Frequency Modulated transmitter circuit is a wireless device that operates in a high frequency range.

It can transmit audio signals to the atmosphere through electromagnetic waves, and can be received by an FM receiver circuit tuned to the same frequency as the transmitter, to reproduce signals from; songs, voice, musical instruments, etc. on the FM receiver.

ATTENTION!

For each Country, Region, State... There are Laws on broadcasting, telecommunications, audio and video transmission, etc.

Do not use telecommunications equipment without authorization from the entities responsible for transmitting Radio Frequencies.

Electronic Circuits teaches electronics applied to various segments, with the aim of improving knowledge, we do not support or take responsibility for any type of illegal operation.

For any operation with RF, we recommend looking for the competent regulatory agencies, seeking certification and/or legalization.

FM Transmitter 70MHz to 150MHz using MAX2606 IC with PCB
FM Transmitter 75 to 108MHz using BA1404 IC with PCB

Characteristics!

High sensitivity of audio pickup
12V to 16Vdc supply voltage
Simple circuit to assemble
Great range, about 2.5km
Easy assembly

Circuit Operation

The circuit uses two RF transistors; Q1 2N2218 used as RF oscillator, and transistor Q2 2N3866, used for power stage.

The decouple electrolytic capacitor C1, receives the audio signal, who comes from a signal source, which can be a soundboard, a USB audio card, a musical instrument, or any other signal source.

This modulated signal is sent to the base of transistor Q1, it works as an oscillator circuit, the trimmer VC1 in parallel with the coil L1, adjusts the circuit operating frequency.

Transistor Q2 works as the power stage of the transmitter, it amplifies the RF signal generated by Q1, and sends it to the output, composed by the antenna.

Trimmers VC2 and VC3 connected to the antenna, adjust the impedance of the antenna coupled to the output, which we must adjust for better impedance matching, and to obtain the best signal at the output.

Applications!

Audio transmitter
Audio link for instruments
Wireless microphones
Spy Microphone
Homemade FM radio

Schematic diagram

The schematic diagram of the 2.5 km FM Transmitter is in Figure 2 below. As we can see, it is a very simple circuit, however, it is not recommended for those who have no experience with electronic circuit assembly.

It is recommended to mount this circuit in a metal box, if you do not have a metal box, glue aluminum foil on the walls of the box to shield the entire circuit from external interference.

Fig. 2 - Schematic 2.5KM FM transmitter, using transistor 2N3866

Circuit Adjustments

The transmitter frequency adjustment, is regulated through the CV1 trimmer, and the CV2 and CV3 trimmers, to regulate the antenna impedance matching, must be done with patience for a better use.

The coil L1, L2 and L3 must be made with enameled wire 22 AWG of 1 cm in diameter with air core, the number of turns is described in the component list.

L4 is a 10uH RF shock, and you could be building your own RF shock by winding 15 vols of thin enamel wire around a 1MΩ resistor, soldering to both ends of the copper wire, at each end of the resistor.

The antenna can be a length of rigid wire between 20 and 50 cm for short ranges, or use a 1/2 wave dipole antenna for long ranges.

The Power Supply

The power source can be from 12Vdc to 16Vdc, if a power supply is used, well filtered sources must be used, due to the sensitivity of the circuit.

Don't use large wires, always use short wires, and shield the transmitter circuit source. The current consumed by the circuit is around 120mA when powered by 12V, and 400mA when powered by 16V.

List of materials

Semiconductors

Q1 ............. 2N2218 or 2N2219 NPN transistor
Q2 .............. 2N3866 or 2N4427 NPN Transistor

Resistors

R1, R2 ....... 10KΩ 1/4W Resistor (brown, black, orange, gold)
R3 ............. 47Ω 1/4W Resistor (yellow, violet, black, gold)
PT1 ........... 10KΩ Potentiometer

Capacitors

C1 ............. 2.2uF /16V Electrolytic Capacitor
C2, C3 ....... 1nF Ceramic/Polyester Capacitor
C4, C5 ....... 8.2pF Ceramic Capacitor
VC1, 2, 3 ... 0 ~ 47pF Trimmers

Coils

L1 ............... 4 Turns, 7mm diameter Inductor
L2 ............... 3 Turns, 7mm diameter Inductor
L3 ............... 5 Turns, 7mm diameter Inductor
L4 ............... RFC - 10uH Inductor *See Text

Miscellaneous

P1, P2 .... Screw Terminal Type 5mm 2-Pin Connector
Other ........................... PCB, Wires, Speaker, etc.

All to make it easier for you to do a more optimized assembly, either at home, or with a company that prints the board. You can download the files in the Download option below.

Fig. 3 - PCB - 2.5KM FM transmitter, using transistor 2N3866

Files to download, Direct Link:

Click on the link beside: GERBER, PDF and PNG files

If you have any questions, suggestions or corrections, please leave them in the comments, and we will answer them soon.

Subscribe to our blog! Click Here - elcircuits.com!

My Best Regards!

14V 4 Channel 200W MOSFET Quad Bridge Power Amplifier using TDA7850 with PCB

Electronic Circuits Amplifier , Circuits to Assemble

Fig. 1 - 14V 4 Channel 200W MOSFET Quad Bridge Power Amplifier using TDA7850 with PCB

This is a 14V 4 Channel 200W MOSFET Quad Bridge Power Amplifier, it uses an TDA7850 Integrated Circuits, in Quad Bridge Mode to drive four power speakers.

The circuit provides a total output power of 200W, and this with good sound quality, powered from a unipolar 14V power supply.

The Amplifier responds very well to all audible frequency ranges, and has a minimalist, compact design, which makes this amplifier a good choice for an unprecedented range of application.

IC Description

The TDA7850 is a breakthrough MOSFET technology Class AB audio power amplifier in Flexiwatt 25 package designed for high power car radio.

The fully complementary P-Channel / N-Channel output structure allows a rail to rail output voltage swing which, combined with high output current and minimized saturation losses sets new power references in the car-radio field, with unparalleled distortion performances.

The TDA7850 integrates a DC offset detector.

24W Stereo Hi-Fi Audio Amplifier using TDA2616 + PCB
68W Hi-Fi Audio Power Amplifier using LM3886T IC + PCB
4 x 50W High Power Amplifier, 14.4V - IC TDA7563A + PCB
320W Power Audio Amplifier, Powered with 14.4V - 2Ω with IC TDA7560 + PCB
100W RMS Audio Amplifier IC TDA7294 + PCB
200W RMS Stereo Power Amplifier with IC STK4231II + PCB

IC Features

High output power capability:

4 x 50W / 4Ω max.
4 x 30W / 4Ω @ 14.4 V, 1 kHz, 10 %
4 x 80W / 2Ω max.
4 x 55W / 2Ω @ 14.4V, 1 kHz, 10 %

MOSFET output power stage
Excellent 2Ω driving capability
Hi-Fi class distortion
Low output noise
ST-BY function
Mute function
Auto mute at min. supply voltage detection
Low external component count:

Internally fixed gain (26 dB)
No external compensation
No bootstrap capacitors

On board 0.35 A high side driver

The Schematic Circuit

In Figure 2 below, we have available the schematic diagram of the 14V 4 Channel 200W MOSFET power amplifier circuit, this circuit is quite simple to assemble.

As we can see there are very few external components, making the circuit very simple to assemble, even for a technician or hobbyist with little experience in electronics can assemble it without much difficulty.

Fig. 2 - Diagram 14V 4 Channel 200W MOSFET Quad Bridge Power Amplifier using TDA7850

It is important to remember to be careful when assembling the circuit, as simple as the circuit is. We must be careful not to invert any components, such as capacitors, or invert the input voltage of the circuit, because the integrated circuit or other components can be damaged easily.

Components List

Semiconductors

U1 ............ TDA7850 Integrated Circuit

Resistors

R1 ............ 47KΩ Resistor (yellow, violet, orange, gold)
R2, R3 ..... 10K resistor (brown, black, orange, gold)

Capacitors

C1 to C4 ... 220nF Ceramic/Polyester Capacitor
C5, C6 ...... 1μF Ceramic/Polyester Capacitor
C7 ............. 470nF Ceramic/Polyester Capacitor
C8 ............. 47μF / 25V Electrolytic Capacitor
C9 ............. 2.200μF / 25V Electrolytic Capacitor
C10 ........... 100nF Ceramic/Polyester Capacitor

Miscellaneous

P1 to P9 .... Screw Terminal Type 5mm 2-Pin Connector
Other ........................... PCB, Wires, Speaker, etc.

Power Supply

This amplifier is powered by unipolar source, with direct current, the maximum current required by the circuit is approximately 15 Amperes.

And you can connect it directly to a car battery, or a motorcycle battery, or a no-break battery, or a bench power supply...

The power will be according to the power supply, and as already shown in the IC features above, to have 4 outputs of 50W we have to supply the circuit with 14.4V.

Printed Circuit Board

All to make it easier for you to do a more optimized assembly, either at home, or with a company that prints the board. You can download the files in the Download option below.

Fig. 3 - PCB 14V 4 Channel 200W MOSFET Quad Bridge Power Amplifier using TDA7850

Files to Download, Direct Link:

Click on the link beside: GERBER, PDF and PNG files

If you have any questions, suggestions or corrections, please leave them in the comments, and we will answer them soon.

Subscribe to our blog!!! Click Here - elcircuits.com!

My Best Regards!!!

Monday, July 4, 2022

You may be interested in:

Features

Product application

External programming of the load current:

General Formula:

The Circuit Schematic

Printed Circuit Board

Files to download, Direct Link:

Wednesday, June 22, 2022

General IC Description

Features

Output Voltage Setting

General Formula:

For a 3.3V output, our formula would look like:

For a 5V output, our formula would look like:

For a 9V output, our formula would look like:

For a 12V output, our formula would look like:

For a 26V output, our formula would look like:

The Circuit Schematic

Printed Circuit Board

Fig. 3 - PCB 5A, 1.22V to 26V, 500kHz Step-Down Converter Using RT8289 IC

Files to download, Direct Link:

Wednesday, May 18, 2022

The circuit

Transistor Description

How it works

The Circuit

Component List

The PCB - Files to Download

Files to download, Direct Link:

Tuesday, May 3, 2022

Feature

Applications

ATTENTION!

You might also be interested in:

The transmitter circuit

The Coil

The Antenna

Component List

The PCB - Files to Download

Files to download, Direct Link:

Wednesday, April 27, 2022

The Transmitter

ATTENTION!

You might also be interested in:

Characteristics!

Circuit Operation

Applications!

Schematic diagram

Circuit Adjustments

The Power Supply

List of materials

Files to download, Direct Link:

Wednesday, April 6, 2022

IC Description

You might also be interested in:

IC Features

The Schematic Circuit

Components List

Power Supply

Printed Circuit Board

Files to Download, Direct Link:

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