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Build help and troubleshooting => MP573 Microphone preamplifier => Topic started by: ddld on October 19, 2023, 12:09:31 PM

Title: How much deviation of the voltages is acceptable during setup?
Post by: ddld on October 19, 2023, 12:09:31 PM

Hi,

I'm in the setup process. According to the setup manual, the voltage between TP1 and V+ should be 'approximately' 24.2 volt without the transformer, and 'a little lower' with the transformer. I am seeing exactly 25.08 volt in both cases. Is that a reason for concern, or does it fall within the tolerances?

Title: Re: How much deviation of the voltages is acceptable during setup?
Post by: JPK on October 21, 2023, 09:34:32 AM

The measured voltages depend on the actual PSU of your lunchbox so a 10% deviation is acceptable.
Plugging in the output transformer should show a small decrease in the V+ voltage.
If it doesn't, check your output tansformer connections, verify the output transformer DC resistances.