| Electronics > Repair |
| Pics of 20Hz, 1KHz, 20KHz amplifier signal. Why is the signal shape different? |
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| olegau:
--- Quote from: Zero999 on January 13, 2025, 12:42:43 pm --- What's the setting on the bass control? Does setting it to the maximum help? --- End quote --- All tone controls are flat position. |
| Zero999:
I've simulated an amplifier with a low cut-off of 16Hz (due to C1 and R1) a gain of 10 (Avol=10) and an upper cut-off of 30kHz (GBW = F*G = 30k*10= 300k). The slew-rate is 10MV/s which should be fast enough, not to affect the result. Schematic. 20Hz 1kHz 20kHz Conclusion: the plots look similar to your oscillograph, so the channel you're measuring is working properly. The .asc LTSpice file with the frequency set to 1kHz. |
| Greybeard:
Perfect match! :-+ fc=1/(2*pi*R*C)=1/(2*3.14*100k*100E-9)=15.9Hz Your Amp ist specified 15 Hz - 50 kHz /-3dB ( https://audio-database.com/YAMAHA/amp/ca-700.html ). |
| olegau:
Thanks! I can sleep well:) |
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