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Bugle DC offset into the danger zone

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MrRalph

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Bugle DC offset into the danger zone
« on: 3 Jul 2008, 05:29 pm »
Finished my Bugle, updated my measurements without input or output connected. Measured +- 9.23V on -VE (4) and +VE (8) on U1/2/3.

DC offset for Out1 (1) and Out 2 (7) is:
U1: 150mV
U2: 1700mV
U3: 150mV

What could be wrong or what should I test?

Any tips are highly appreciated!

Ralph
« Last Edit: 4 Jul 2008, 06:13 pm by MrRalph »
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hagtech

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Re: Bugle DC offset into the danger zone
« Reply #1 on: 10 Jul 2008, 04:44 am »
That sounds awfully high.  1.7V is about 100x too much.  Could be a very leaky 0.22uF coupling cap (did you use PIO?).  Maybe wrong resistor value or you used a different opamp.

jh
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MrRalph

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Re: Bugle DC offset into the danger zone
« Reply #2 on: 10 Jul 2008, 12:53 pm »
I'm very sure the resistor values are correct. For the capacitors I'm using standard new Wima MKP4/10 capacitors. The op amps are NE5532's.

Ralph
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