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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Salas DCG3 preamp (line & headphone)
Salas DCG3 preamp (line & headphone)
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Old 7th October 2018, 03:58 AM   #3171
Salas is online now Salas  Greece
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Salas DCG3 preamp (line & headphone)
The two pots output impedance will add up. That impedance is source to the preamp and augments the R element of its RC input filter. The more RC slows down the slew rate response and narrows the HF -3dB frequency response point. You would want the total to stay within the range of the 20K-50K recommendation for DCG3. The article's Fig.7 standard configuration that says below it "BAL = 2.5 VOL. For example: VOL = 10k log, BAL = 25k linear" should be like a 35K standalone pot for output impedance.
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Old 7th October 2018, 09:53 PM   #3172
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Thanks Salas. I actually meant a 20K log for volume and a 50K linear with the added resistor for balance with a switch to short out the balance control until needed.
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Old 11th October 2018, 09:00 PM   #3173
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Salas DCG3 preamp (line & headphone)
Set up that pots system alone first and measure its resistance from input to output when rotating so to find the max. See if it falls in the recommended range or to change pot values. The equivalent max for series type 20k-50k nominal pots is 5k-12.5k when at half point value travel.
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