# Adjustable Power Supply 1.25v to 57V, 6 Amps using TIP36C + LM317HV + PCB

The LM317HV is an adjustable 3-terminal positive voltage regulator capable of supplying 1.5 A or more currents over a 1.25V to 57V output voltage range. It requires only two external resistors to set the output voltage. The LM317HV is packaged in standard transistor packages that are easily mounted and handled.

However, the LM317HV supports high voltage, but the current is still low, only 1.5A, our circuit, we are increasing a drive circuit to increase the current we need to 6 Amps, with three TIP36C transistors,Â which provides an adjustable output voltage between 1.25v to 57 volts, with a current of 6 Amps, which is enough for a bench power supply.

The Circuit

The schematic electrical diagram, which follows in Figure 2 below, it's very simple, first one, we have the voltage input that comes through connector J1, which enters through resistor R1, that as long as there is no current greater than the one calculated, there is no drop of voltage in R1, more if the current increases, there will be a voltage drop of approximately 0.6V, which will cause the transistors to saturate, causing the current to pass through the power transistors.

The capacitor C1 has the objective of attenuating the interference of the ripples and their stability. Capacitor C2 has the function of eliminating high interference, and capacitor C3 has the function of constancy to decrease the ripple and stability of the power supply.Â

P1, is a 5K analog potentiometer, if you donâ€™t have 5K you can put 4.7K, which is more commercial, the diodes D1 and D2 are to avoid reverse voltage over the Integrated Circuit U1, and in the transistors, resistors R3, R4 and R5, are impact resistors, which attenuate the difference between the transistors and prevent one from working more than the other.
 Fig. 2- Adjustable Power Supply Schematic LM317HV + TIP36

## Components list

• U1â€¦â€¦â€¦â€¦â€¦.... LM317HV â€“ Integrated circuit, voltage regulator
• Q1,Q2,Q3 ...â€¦... TIP46C Power Transistor
• D1, D2 â€¦â€¦â€¦....1N4007- Silicon rectifier diodes
• C1 â€¦â€¦â€¦â€¦â€¦... 470 uF â€“ 65V â€“ Electrolytic capacitor
• C2 â€¦â€¦â€¦â€¦â€¦... 100 nFÂ  Ceramic capacitor
• C3 â€¦â€¦â€¦â€¦â€¦... 2200 uF â€“ 65V â€“ Electrolytic capacitor
• R1 â€¦â€¦â€¦â€¦â€¦... 10 ohms â€“ 1W â€“ brown, black, black, gold
• R2 â€¦â€¦â€¦â€¦â€¦... 2K ohms â€“ 1/4 W â€“ red, black, orange, gold
• R3, R4, R5 .â€¦.... 0.22 ohms â€“ 5W â€“ red, red, silver, gold
• R6 â€¦â€¦â€¦â€¦â€¦... 220 ohms â€“ 1/4W â€“ red, red,Â brown, gold
• P1 â€¦â€¦â€¦â€¦â€¦... 5 K ohms or 4,7 k ohms â€“ Linear potentiometer
• J1, J2 â€¦â€¦.â€¦â€¦. Kre Block Terminal Terminal 2-Way Double Connector
• Others ............â€¦ Printed Circuit Board, tin, wire, etc.

We are offering toÂ DownloadÂ the link with the printed circuit board printing files, they are;Â Gerber, PDF layout, PNG, all the files with a direct link to Mega.