UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

mole42uk · 1st Oct 2018, 7:57 pm

An update - Here's a picture of two naughty components, U103 (the TLC271) which provides the -7V rail, and U109 (the 4053) which, as predicted by Dave, is mis-behaving, oscillating at about 2 c/s.

I've replaced the 271 which has restored order and calm to the power supplies, but I'm still waiting for the 4053 to be delivered.

Just a thought, when it's working again I'd like to check that the calibration isn't too far away. Are thiose £5 voltage references that can be bought from ebay accurate at all?

Further updates to follow.

1st Oct 2018, 7:57 pm	#12
mole42uk Nonode Join Date: Aug 2010 Location: Resolven, Wales; and Bristol, England Posts: 2,608	Re: I've injured my Keithley 175 DMM An update - Here's a picture of two naughty components, U103 (the TLC271) which provides the -7V rail, and U109 (the 4053) which, as predicted by Dave, is mis-behaving, oscillating at about 2 c/s. I've replaced the 271 which has restored order and calm to the power supplies, but I'm still waiting for the 4053 to be delivered. Just a thought, when it's working again I'd like to check that the calibration isn't too far away. Are thiose £5 voltage references that can be bought from ebay accurate at all? Further updates to follow. Attached Thumbnails __________________ Richard Index: recursive loop: see recursive loop