Search found 6 matches

by DevilledEggs
25 Nov 2021, 18:27
Forum: Support
Topic: Nonfunctional Gigatron.
Replies: 10
Views: 126

Re: Nonfunctional Gigatron.

I found out you can use an arduino and make a simple oscilloscope with processing IDE and I tried it with my signal generator and it seems to be pretty accurate, out of curiosity what should the waveform look like? Should it be a square wave, a sine wave? My common sense and good bit of electrical ...
by DevilledEggs
24 Nov 2021, 22:46
Forum: Support
Topic: Nonfunctional Gigatron.
Replies: 10
Views: 126

Re: Nonfunctional Gigatron.

If you have a scope, one of the first things I'd check is the clock output. Another thing to check would be the power supply, maybe try another one with a higher mA rating. Ok, I will check. That sounds like a good idea! I have a scope, but I don't know if it works after my basement flooded, we'll ...
by DevilledEggs
24 Nov 2021, 21:31
Forum: Support
Topic: Nonfunctional Gigatron.
Replies: 10
Views: 126

Re: Nonfunctional Gigatron.

It's painful but have you checked for shorts/open circuits on every chip using a multi-meter whilst the board is not powered? Have you measured the voltage across a random selection of the TTL chips? (VCC should be 4.75v to 5.25v) It's hard to tell, but it looks like you have used HCT as your TTL f...
by DevilledEggs
24 Nov 2021, 15:48
Forum: Support
Topic: Nonfunctional Gigatron.
Replies: 10
Views: 126

Re: Nonfunctional Gigatron.

It's painful but have you checked for shorts/open circuits on every chip using a multi-meter whilst the board is not powered? Have you measured the voltage across a random selection of the TTL chips? (VCC should be 4.75v to 5.25v) It's hard to tell, but it looks like you have used HCT as your TTL f...
by DevilledEggs
24 Nov 2021, 11:55
Forum: Support
Topic: Nonfunctional Gigatron.
Replies: 10
Views: 126

Re: Nonfunctional Gigatron.

If you have a scope, one of the first things I'd check is the clock output. Another thing to check would be the power supply, maybe try another one with a higher mA rating. Ok, I will check. That sounds like a good idea! I have a scope, but I don't know if it works after my basement flooded, we'll ...
by DevilledEggs
24 Nov 2021, 00:02
Forum: Support
Topic: Nonfunctional Gigatron.
Replies: 10
Views: 126

Nonfunctional Gigatron.

I know this is a rare case when it comes to support but, I have exercised all of the options and this is the only remaining one; I emailed support/Walter a while ago, but no luck persists. I assembled my Gigatron during the pandemic and from the time I assembled it, it has not worked. I have looked ...