Bench Power Supply | Electronic Project Circuits

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bench variable power supply 0-30V

Today I seeks variable power supply circuit come to deposit again. Which be the circuit that use base equipment, build not difficult follow the circuit can fine volt get 0-30V , give current get about 1-2A depend on transformer at you choose to use. The prominent point of the circuit use transistor join a pin BE replace Zener Diode. Then get around problems about seek buy Zener voltage that can’t want. By transistor at use 2N3638 numbers or the number replaces. For transistor output use 2N3055 durable numbers current not exceed 2A. For other detail , request friends , see in the circuit better.

Be the first to comment - What do you think? Posted by admin - November 23, 2008 at 11:40 am

Categories: Power supply, Variable Regulator Tags: 0-30V power supply, bench power supply, variable power supply

Bench Power Supply by PIC16F870

This unit delivers 0 to 20 volts at up to 4 amps in 0.1 volt increments. The entire device runs on a PIC16F870 (about $3 in small quantities). This is basically a switching power supply with the voltage regulation done in software. The PIC used here has analog inputs (used to measure voltage and current) and hardware PWM (pulse width modulation) output used to control the power.

Only two controls are used on the front panel – an ‘on/off” push button and a rotary encoder. The on/off button is a ‘soft’ control; the unit actually stays powered up all of the time. In the ‘off” mode, the display is blanked except for the far right decimal which acts as a standby indicator, and the voltage output is set to zero. Also, while in this mode, the rotary encoder is not active so that the previously selected voltage will be maintained when the unit is powered back on.

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