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Bench PSU



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Specifications
Size 73mm(H) 200mm(W) 215mm(D)
DC output 0-19.99V, 0-1.999A
AC input 230V
Weight 2.4kg


This useful homebrew bench power supply was first built in 1983.

In 2001 after 18 years of use, it stopped working. It was then lovingly rebuilt using the original transformers, case and LED displays. An improvement was made to make the output voltage adjustable down to 0.00V using negative bias to the regulator. (The previous LM317 regulator design could not be set lower than 1.20V.)

The supply can operate in constant-voltage or constant-current mode.
Click on a thumbnail below to see a larger picture

The 7-segment LED displays are mounted in 90° IC sockets.
The voltage and current are measured with two ICL7107 3½-digit meters. The displays resolve to 10mV and 1mA.
Click here for the ICL71707 datasheet (PDF 534kB).

The voltage control is a 10-turn wirewound pot for precision voltage setting.

The LED between the voltage and current displays illuminates in constant current mode.

The front-panel assembly.

General view.
127,950 hits since 13th Nov 2005