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

TonyDuell · 1st Mar 2019, 7:07 pm

Is there any way to get to the 'lower' PCB in one of the photos that seems to be full of DIL-packaged ICs?

I'd start by checking the +5V supply rail. You have some TTL chips on the PCB you can see, look up the data sheets and identify the power connections. Check with a voltmeter and 'scope that you have +5V without significant ripple between the Vcc pin and the ground pin.

1st Mar 2019, 7:07 pm	#10
TonyDuell Dekatron Join Date: Jun 2015 Location: Biggin Hill, London, UK. Posts: 5,224	Re: Digeec nixie clock Is there any way to get to the 'lower' PCB in one of the photos that seems to be full of DIL-packaged ICs? I'd start by checking the +5V supply rail. You have some TTL chips on the PCB you can see, look up the data sheets and identify the power connections. Check with a voltmeter and 'scope that you have +5V without significant ripple between the Vcc pin and the ground pin.