finding faults

sriegel · 15th April 2002, 11:17 PM

hi all,
first, i searched this to no avail.
i'm working on debugging an aleph amp and here's my last problem;

on start up there is static out of one channel, it's been getting worse, slowly, now it is sort of a static howl sound. it goes away once the amp warms up and then plays beautifully and quietly. i've had it on for over 9 hours at a time with no prob's after warm up ~20-30 minutes so i suspect that all of my critical components are okay or it would not get better.
i searched on the forum for help and the closest thing i found was possible p.s. cap's misbehaving. the ones i hava are el-cheapo, no-name, so i'm wondering if there is an easy way to check my caps before i lay down $100 or so to get new ones.

thanks for any advice,
scott

Nelson Pass · 17th April 2002, 07:36 PM

Check your Zener diodes.

sriegel · 18th April 2002, 01:57 AM

nelson,
thanks for the reply. i'll check the zeners. can you tell me what exactly the zeners do in this circuit and how they might result in static? just curious.

this project has been very interesting, trying at times, but boy, when i hear that amp......... it's all worth it!!!
thanks so much for the opportunity to enjoy music to this degree!

cheers,
scott

15th April 2002, 11:17 PM	#1
sriegel diyAudio Member Join Date: Nov 2001	finding faults hi all, first, i searched this to no avail. i'm working on debugging an aleph amp and here's my last problem; on start up there is static out of one channel, it's been getting worse, slowly, now it is sort of a static howl sound. it goes away once the amp warms up and then plays beautifully and quietly. i've had it on for over 9 hours at a time with no prob's after warm up ~20-30 minutes so i suspect that all of my critical components are okay or it would not get better. i searched on the forum for help and the closest thing i found was possible p.s. cap's misbehaving. the ones i hava are el-cheapo, no-name, so i'm wondering if there is an easy way to check my caps before i lay down $100 or so to get new ones. thanks for any advice, scott

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17th April 2002, 07:36 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	Check your Zener diodes.

18th April 2002, 01:57 AM	#3
sriegel diyAudio Member Join Date: Nov 2001	nelson, thanks for the reply. i'll check the zeners. can you tell me what exactly the zeners do in this circuit and how they might result in static? just curious. this project has been very interesting, trying at times, but boy, when i hear that amp......... it's all worth it!!! thanks so much for the opportunity to enjoy music to this degree! cheers, scott