UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Device to simulate a dual rail power supply from a single DC source

Mooly · 1st Aug 2020, 1:51 pm

I added a simple 'virtual ground' option thus giving a split supply to one of my old Farnell PSU's. These had three terminals on the front (one is never used and for constant current as I recall).

I used an opamp (741 I think) and pair of small complementary output transistors with simple current limiting for each. So the virtual ground gives a split rail to whatever the main supply is set at and with a 100ma limit per rail.

It has proved invaluable over the years.

1st Aug 2020, 1:51 pm	#22
Mooly Octode Join Date: May 2011 Location: Lancashire, UK. Posts: 1,351	Re: Device to simulate a dual rail power supply from a single DC source I added a simple 'virtual ground' option thus giving a split supply to one of my old Farnell PSU's. These had three terminals on the front (one is never used and for constant current as I recall). I used an opamp (741 I think) and pair of small complementary output transistors with simple current limiting for each. So the virtual ground gives a split rail to whatever the main supply is set at and with a 100ma limit per rail. It has proved invaluable over the years.