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Recent content by Hertzilla

  1. H

    VU Meter Buffer Gain Adjustment

    I replaced R129 with a 100 ohm 1% resistor, providing the correct attenuation at just under 1dB. Thanks.
  2. H

    VU Meter Buffer Gain Adjustment

    Thanks for all the responses. I'm not looking to change detection level/time constant, only amplitude. Although adjustable gain would be ideal, I only need to match the output of this to another identical circuit (for left & right VU meters), so just attenuating the signal by 1/2 to 1db or so...
  3. H

    VU Meter Buffer Gain Adjustment

    I'm looking for a simple way (minimum components) to pre-set/adjust the gain of this mixing console VU meter circuit by approx. +/-1db: Component values: -------------------- R125, R128 = 470K R129 = 10 ohms C103, C105 = 22uf IC26 = TL071 Thanks!
  4. H

    Audire Power Amp Oscillating

    Thanks Brian... The electrolytic on the + rail has been replaced. The one on the - rail checks good on my ESR & capacitance meters. The amp actually uses a separate power supply for each channel (dual mono). The reservoir caps in both channels are OK - all have low ESR and clean DC output. The...
  5. H

    Audire Power Amp Oscillating

    Thanks for responding... Putting caps on the output has no effect on the problem, and the wires to the PCB are already twisted. The problem is very intermittent - usually worse when first powered on. When it acts up again I will try your suggestion with the ferrite choke. Another possible clue...
  6. H

    Audire Power Amp Oscillating

    The factory added input level pots to each channel of this stereo amp (a custom mod for the purchaser) when it was built years ago. Now one of the channels is oscillating. The oscillation affects the audio range and will vary somewhat in frequency and amplitude depending on the setting of the...
  7. H

    How Do I Change Gain on a 4 Pole LP Filter?

    I used TI's "WEBENCH Filter Designer" online to design a 4 pole low pass filter. The cutoff freq. is 10.5 kHz. The pass band gain of the circuit is unity, but what I actually need is a gain of -6.5 dB @ 1 kHz. The software won't let me enter negative numbers, so I can't determine what I need...
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