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  1. Replies
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    When lifting the diodes you increased the signal...

    When lifting the diodes you increased the signal level going to the eq. That will get you distortion when turning up the controls on the eq. Theres not much headroom in a 9V system. I would lower the...
  2. I have the "plus" schematic. That is what they...

    I have the "plus" schematic. That is what they sent me. Not the one you can find online. The problem is I will not start digging in without a correct schematic under the presumption that it is the...
  3. There is a PWM signal going to a PCB card with an...

    There is a PWM signal going to a PCB card with an IRS20955 driving two IRFB4227 per channel and output filters, then going to the speaker jacks. The power amp on the schematic is nowhere to be seen....
  4. Schematic for the "Phonic powerpod k12 plus" with class D power amp?

    The swedish distributor sent me a schematic but its not the right power amp on the schematic. The schematic shows an analog power amp with 12 transistors but in the mixer sits a class D one with four...
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    Schematic for rcf art 325 Ai ?

    Schematic for rcf art 325 Ai ?
  6. I put in a 2n4392 and that works well with 9V my...

    I put in a 2n4392 and that works well with 9V my opamps clip well before the fetswitch so i solved the problem without increasing voltage.

    My question now is about the diod and why the bas116 dont...
  7. What kind of diode should one use? I tried the...

    What kind of diode should one use? I tried the 1N4148 and it seems to work. But when i tried the BAS116 the on delay is in "seconds"! I dont get whats happening here.
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    Try it inside a chassis to...

    Try it inside a chassis to...
  9. I think though Im gonna give up on this and go...

    I think though Im gonna give up on this and go with the single jfet. They are tiny in smt.
  10. Its pretty fast, 45 μs. But can be made soft by...

    Its pretty fast, 45 μs. But can be made soft by delaying full current onset. The thing is that its a single switch in a pretty big capsule.
  11. As i said that would work if the mute is soft. If...

    As i said that would work if the mute is soft. If you mute abruptly with the exakt same fast switch you havent got rid of the problem. You just killed of the signal abruptly when muting and that will...
  12. Try muting this tone on and off...

    Try muting this tone on and off https://www.youtube.com/watch?v=G9oYClOrS-k This is the fenomena Im talking about. It doesnt get as severe with guitar tone because its not a single sine wave, but its...
  13. Okej. But i cant get that to work in my brain. It...

    Okej. But i cant get that to work in my brain. It does the same thing, abruptly switch the signal to off. That should produce the same fenomena.
    But that would be a god idea if one have a lot of...
  14. The pop isnt something extra thats added. Its the...

    The pop isnt something extra thats added. Its the sound that happens when you abruptly switches between signals. It doesnt pop when switching without signal. This pop isnt very loud but its enough...
  15. Well, a single jfet transistor switch can be made...

    Well, a single jfet transistor switch can be made to go smooth by a simple RC network so an analog switch isnt always absolutely on or off. The thing is that for example the 4066 has a buffer that...
  16. I think dubbling the voltage makes me use a jfet...

    I think dubbling the voltage makes me use a jfet with low Vgs so i dont have to "hand select". The higher voltage also makes me able to change a couple of rail to rail op amps in the circuit to...
  17. Something like this perhaps? ...

    Something like this perhaps? http://www.mouser.com/ds/2/465/icl7660-522496.pdf
    That would thought push my 4013 that i use to flipp flopp to its absolute maximum rating so perhaps attenuate the 18V...
  18. Hm, would a charge pump IC need extra filtering...

    Hm, would a charge pump IC need extra filtering for switching spikes and such?

    Yea an optocoupler would be very easy way to go but they are realy bulky and i would need 3 of them in a small...
  19. No, i want it to be compatible with a DC9V...

    No, i want it to be compatible with a DC9V adaptor. +/- supply would make a lot of things easier but this is going to be for guitar pedals and the 9V supply is a standard.
  20. Yes but it switches abruptly, se the other thread...

    Yes but it switches abruptly, se the other thread I just started. http://music-electronics-forum.com/t40908/
  21. Analog switch IC that can be made smooth switching?

    I tried switching the audio with an 4066. But it switched abruptly. And if I put a resistor/capacitor on the trigger do delay it, it just switches abruptly after the delay.

    So my question is...Is...
  22. Its basicly guitar pickup level. That would be...

    Its basicly guitar pickup level. That would be fine if you only look at the ratings from the manufacturer, for example 400mV(dont know if that is peak or rms) . But when i look att the guitar signal...
  23. That doesnt seem to work in spice simulation. The...

    That doesnt seem to work in spice simulation. The transistor wont close properly in off mode.
  24. That transistor wont close with the voltages i...

    That transistor wont close with the voltages i have.
  25. I have two fets now at home that i tried. The...

    I have two fets now at home that i tried. The 2sk880 doesnt work, it opens slightly at every peak signal, is that beacuse the cutoff voltage isnt negative enought? The 2sk545 works but seems to...
  26. Best available transistor for jfet audio switch?

    What would the best jfet in regards to getting maximum headroom when "on" and minimum leakage when "off" be? One that is available at for example Mouser Electronics - Distributör av elektroniska...
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    Alto pm-12 schematic?

    Alto pm-12 schematic?
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    Wharfedale pro epm-610 schematic?

    Wharfedale pro epm-610 schematic?
    Or another model with the same circuit?
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