In Reply to: That makes sense... posted by sherod on June 24, 2016 at 01:00:33:
Hi sherod,
If you have a decent multimeter you can get close enough. pull the caps and measure their capacitance. It wouldn't surprise me that one or two will be off spec. Do the same for the resistor. the calculation is pretty straight forward.
To calculate the time constant for each channel you need to know the R in Ohms and the C in µf. Using the schematic values. 3 X .0039 = .0117, then .0117 X 6200 = 72.54µs. You're just trying to get close to 75µs.
Once you know the actual values you can calculate and correct as required.
Use poly styrene or propylene for replacement caps and a metal film for the resistor.
Have fun!
HA
Hope that makes sense.
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Follow Ups
- RE: That makes sense... - HoosierAudio 08:10:24 06/24/16 (13)
- 75us - sherod 12:32:57 06/27/16 (2)
- RE: That makes sense... - sherod 08:21:46 06/24/16 (9)
- RE: That makes sense... - HoosierAudio 09:17:34 06/24/16 (8)
- Quality of caps - sherod 13:26:17 06/26/16 (4)
- RE: Quality of caps - HoosierAudio 16:12:39 06/26/16 (3)
- No flame wars here... - sherod 16:36:03 06/26/16 (2)
- RE: No flame wars here... - HoosierAudio 17:30:52 06/26/16 (1)
- Thank you... - sherod 17:53:26 06/26/16 (0)
- Got it. Thanks. ---nt - sherod 09:30:36 06/24/16 (2)
- RE: Got it. Thanks. ---nt - HoosierAudio 18:30:12 06/25/16 (1)
- Thank you... - sherod 18:39:46 06/25/16 (0)