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 Post subject: Faulty cap?
PostPosted: Fri Dec 16, 2022 12:21 pm 
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Joined: Fri Dec 16, 2022 11:54 am
Posts: 1
Hi there, I’m finally putting my TC15 kit together which has been good fun, my most elaborate build yet. I’m just trying to isolate the issues I’m having so thought I’d ask here:


Im getting buzz from the speaker at all times, everything turned down, no instrument, all channels etc

Channel 1 is loud, volume knob anywhere past 1-2 gets it outside of bedroom volume. Channel 2 is nowhere near as loud, you can crank the knobs and the guitar doesn’t get much louder but the buzzing does get louder.

I’ve gone over the layout a few times and can’t see anything is missing, voltages are all slightly lower than listed on the layout however - about 10% roughly. I’m in the U.K. with 230v if that might make a difference. When I make contact with the turrets to check DC I get sometimes loud pops through the speaker.

Chopsticked everywhere and no wiring seems loose or causes a crackle, I do however get a pop through speaker whenever tapping one of the .01 caps. Could this be a sign of a faulty component? It’s this cap specifically:

Attachment:
C7F9F3E9-E92F-4E3D-8280-953CF03BAD80.jpeg
C7F9F3E9-E92F-4E3D-8280-953CF03BAD80.jpeg [ 853.94 KiB | Viewed 5316 times ]


I’ve got no replacement on hand and won’t get delivery until the new year to swap it, just trying to understand the circuit but better in the meantime! Of course I could always be barking up the wrong tree


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 Post subject: Re: Faulty cap?
PostPosted: Mon Jul 01, 2024 12:12 am 
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Joined: Mon Jul 01, 2024 12:09 am
Posts: 1
Quote:
Hi there, I’m finally putting my TC15 kit together which has been good fun, my most elaborate build yet. I’m just trying to isolate the issues I’m having so thought I’d ask here:


Im getting buzz from the speaker at all times, everything turned down, no instrument, all channels etc

Channel 1 is loud, volume knob anywhere past 1-2 gets it outside of bedroom volume. Channel 2 is nowhere near as loud, you can crank the knobs and the guitar doesn’t get much louder but the buzzing does get louder.

I’ve gone over the layout a few times and can’t see anything is missing, voltages are all slightly lower than listed on the layout however - about 10% roughly. I’m in the U.K. with 230v if that might make a difference. When I make contact with the turrets to check DC I get sometimes loud pops through the speaker.

Chopsticked everywhere and no wiring seems loose or causes a crackle, I do however get a pop through speaker whenever tapping one of the .01 caps. Could this be a sign of a faulty component? It’s this cap specifically:
merge fruit
Attachment:
C7F9F3E9-E92F-4E3D-8280-953CF03BAD80.jpeg


I’ve got no replacement on hand and won’t get delivery until the new year to swap it, just trying to understand the circuit but better in the meantime! Of course I could always be barking up the wrong tree


Hello, the slightly lower voltages you're measuring could be due to the difference in mains voltage between the UK (230V) and the voltage assumed in the kit's instructions. However, a 10% difference shouldn't cause significant issues. Just make sure you're not exceeding the maximum voltage ratings of any components.


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 Post subject: Re: Faulty cap?
PostPosted: Sun Jul 21, 2024 11:06 pm 
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Joined: Wed Oct 11, 2023 9:45 pm
Posts: 2
The constant buzz from the speaker, even with everything turned down, could indicate a grounding issue or interference. Since you mentioned that the volume levels on the channels differ significantly, it might be worth checking the gain stages for Channel 2. Regarding the lower voltages, it’s possible that the UK’s 230V supply could affect performance, especially if the circuit is designed for a different voltage. The popping sounds when tapping the .01 caps could indeed suggest a faulty component or a poor connection. If you can, try to visually inspect the solder joints and ensure everything is secure. Since you don’t have a replacement cap yet, maybe you could temporarily bypass it to see if it changes anything? Just a thought! Good luck, and keep us updated on your progress!
papa's games


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