808 Toms

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whomper
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808 Toms

Post by whomper » Tue Jan 28, 2014 2:15 pm

Have just finished building a three toms build and have run into two issues:

1. Mid and High tom's tune does not behave right. From pos 0-9 it is tuned below audible range, between 9-10 pos is the full sound range. Same goes for both boards. Have checked cap values, all in order. Which component should I check for range issues?
2. Noise board does not issue pink noise, barely white noise. Have used BC550 instead of 559 and rest are as designed.

Any hints?

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Zsolti
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Post by Zsolti » Wed Jan 29, 2014 10:14 am

Have you just simply replaced the BC559 with BC550? One of them is a PNP, the other one is an NPN transistor.

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whomper
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Post by whomper » Wed Jan 29, 2014 10:46 am

Doubled checked tranies and have 1 BC559 and the rest are BC550 inplace of the 549. The strange thing is that the low tom works and for all I can tell, apart from the different caps and 2 resistors, all components are the same to the mid and high boards....

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whomper
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Post by whomper » Wed Jan 29, 2014 2:31 pm

Problem solved... :bang:

Have used 500K pots instead of 500 ohm...

jzurd0
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Post by jzurd0 » Thu Mar 06, 2014 7:14 am

Hi all,

It seems that Erez is not the only one with the noise source problem.

I have the same issue. No noise at all, only hum.

:despair:

Just wondering if anyone could give us a hand on this...

jzurd0
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Post by jzurd0 » Sat Mar 08, 2014 7:16 am

Ok, I was using a +-15V power supply.

With +-12V it works flawlessly.

:youkids:

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antf4rm
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Post by antf4rm » Tue Feb 16, 2016 4:39 am

whomper wrote:Problem solved... :bang:

Have used 500K pots instead of 500 ohm...
That is exactly what i did as well! shit!
I put in some 10k pots just out of intuition and i have a better range but its still not right. Now i know why. :bang:
Where did you find 500 ohm pots?

I cant believe i overlooked that "K" :bang:

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