I understand, I am looking for this type of information before designing the pcb, maybe you can give me some tips that can help me avoid problems. On reputable brands, I have heard the tempo tick tick tick on the amp. Using good power supplies, and for me that is a design error, which is what I want...

Hello, I'm about to build a delay with tap tempo, but I've tried a few designs and they all have tempo noise that is heard in the speaker. Have they told me that the noise is caused by the micro controller? In my case I will use an ATMEGA 48/88. What is the secret to avoid getting these noises? the ...

Hello, there is something wrong with the tone control, the pedal does not sound good, it sounds very dark, the treble pot is almost useless.

Hi, thanks for answering, I am trying to learn and this helps me a lot. 1-Here I leave schemes with different ways of adding a transistor, and I do not understand why the variant, which is actually achieved. this transistor gives more gain there, before the pot? https://thumb.ibb.co/gPUsPe/OVER_4.jp...

Who can explain me in detail, the parts of an overdrive scheme? I am learning and I can not understand some things. For example: The transistors that are in the beginning and at the end of a circuit, those of the end many times are post pot volume and other times behind the pot, why and that they gr...

Lithium_Grim wrote:The Zener is there to protect the mosfet against possible static.

thank you very much

soulsonic wrote:choose a capacitor who's ripple current rating is equal or higher than 2A...

thanks, now nobody made a similar power supply, I can not see any schematic here?

Optical wrote:Are you using an optofet?
It seems to me that the pop could be reduced or eliminated by ramping the fet conductance rather than switching it from high to low a fast as it can

Can you explain how that would be?

Intripped wrote:ok, I HAVE missed something...

anyway there is the 78S series:
http://www.st.com/resource/en/datasheet/cd00000449.pdf

thanks this is the solution!

Now if you can and it does not bother you, tell me with what capacitors to accompany the filtering?

Thanks but I'm looking for something that supports 2amp and this does not help me, but it seems that nobody has information to contribute To clarify, are you saying you NEED each isolated output to have a 2A output current, or 2A overall ? 2Amps is quite a lot from each output, what effects are you...

Hi black03, Take a look at the schematic posted at this link https://www.freestompboxes.org/viewtopic.php?f=1&t=4300&p=121419&hilit=+vht+valvulator#p121419 Disregard the tube related part of that diagram, and see if the supply sections using LM317 can ba usefol to your project. Cheers, ...

Hi, I need to do a power supply with isolated outputs, and some of them support more than 100ma, someone can help me with information. all the sources and schematic that I see are not isolated the outputs, and in some of them lie with the information of the packashing, because the connectors are iso...

Optical wrote:Are you using an optofet?
It seems to me that the pop could be reduced or eliminated by ramping the fet conductance rather than switching it from high to low a fast as it can

Yes, I use the p222A

in this circuit I see that pin 9 and 10 have 150nf and 11 and 12 68nf, in all circuits I see that they place 100nf there, does this influence anything?

You can control ramping of the optofet to some extent using variable current control from the processor How is the overall impression of the optofet causing a momentary muting? I understand that and it is ok, the problem is to energize the circuit the pop is still, of course much more light than a ...

Hello, can someone tell me why the PT2399 is ruined often? I measured my power supply and delivery 9v Hello Black03 But you MUST supply the PT2399 with no more than 5Vdc as can be seen in the previous schematic...!!! What voltage you have at pin 1 on the delay chip respect to ground ?? I understand...

See here: http://valvewizard.co.uk/smalltime.html Pin-6 of the PT2399 is a voltage source that rests at half the chip's supply voltage, which is provided by a 5V regulator in this case, so pin-6 will be at 2.5V. The current sucked out of this pin controls the delay time. An important thing to consi...

for this bypass, an anti-click resistor of 1 mega-ohm between the ground and the input is not needed 1-10Mohm pull down resistor is used to drain signal caps and mitigate the potential differences once the pedal is turned on. It has nothing to do with the relay/3pdt click noise which both do have. ...

Hello, can someone tell me why the PT2399 is ruined often? I measured my power supply and delivery 9v

What is the critical point that causes the pt2399 to break? Can it be reinforced with a capacitor?

for this bypass, an anti-click resistor of 1 mega-ohm between the ground and the input is not needed 1-10Mohm pull down resistor is used to drain signal caps and mitigate the potential differences once the pedal is turned on. It has nothing to do with the relay/3pdt click noise which both do have. ...