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If all else fails I'll try lowering R12, but so far it doesn't look like it will be an issue in a real world use.

Seems like it is time related. For the first few switches after power is applied, or during the first few seconds/maybe minutes after power on there will be a pop - after that it is silent. I am starting to think that it might have something to do with the power supply I use to test maybe...

Thanks. I will investigate more

Hi, I have built 2 Drebbels and they both thump when engaged. Is this just the nature or this schematic or is there a way to reduce the thump?

Can you be a bit more specific? I am assuming that the low volume is when the pedal in engaged? Is that correct? Also, the gain knob. Does it work as intended or more like a volume knob?

A lot will depend on the capacitance in the circuit. There are 10uF capacitors across the power supply which is a good start as they are well under the 100uF which is specified. Traco also do this kind of converter, but I am not sure if the pinouts and sizing are the same.

I think from memory I have 3 diodes soldered together to replace 2 diodes in a king of tone clone to get the same overall Vf as in the original.

Yep. I know from experience that if I try to troubleshoot when I am frustrated I can do more harm than good. It can be an idea to leave it for a bit and come back calmer. When you checked all you components did you check the markings, or did you measure them (Measure resistance and...

I just finished one of these. When it was first built it did the same thing - with the rate light on continuously. Then I remembered to put all the ICs into the sockets and it worked perfectly. I have even changed R11 to a higher value because I am using high brightness LEDs and it works...

It looks to me as if 2sk208 and 2sk30 have different pinouts, so you will have to take that into account if you are substituting

The gain pot increases gain, but it also blends between clean and dirty signals. If you are getting no overdrive and the gain pot acts as a volume it is almost certain that the signal is just not getting through the overdrive part of the circuit at all. If it was me I would be tracing through...

Assuming you define continuity as under a few ohms resistance then you should only get continuity to all 3 release pot lugs with the pot all the way anticlockwise. Turn it as far clockwise as it will go and you should then get about 50k ohms between the LED K and the pot lug 1.

Is that the one they call (I think) candy purple metal flake? If so there is one in my cart at the moment :-)

Thanks. Yeah, not lots of white - black box with just the labels for the controls in white, so I will get it done twice just to make sure. Thanks

For those with experience getting printing done by Tayda: If I want to get white markings on a dark background (black or dark blue) do I need to pay to get the white printed twice or is a single printing of white enough?

I would be suspicious of a short. First thing I would do is check the resistance between the power supply rails (Gnd, Vrf and 9V. If one is shorted or close to then either visually inspect for a short or start removing components that run between the 2 shorted rails until the short goes. I...

I have just replaced both the footswitches on one of these too. I have heard a lot of moaning about EHX footswitch quality - not just on these units. I haven't traced mine, but I reckon you could work out something similar - possibly even better/more to your taste. Not sure about where the...

I am not an expert on this particular circuit. The MOSFET is part of the HT for the tubes. Getting too hot suggests a short. I would be removing the tubes and testing all the components around the MOSFET for shorts. If that all seems fine I would be replacing the MOSFET and seeing in the...

Your input and output jacks are wired incorrectly. The yellow wires connected to the ground pads on the board are connected to the signal connectors on the sockets. If you reverse those connections on the sockets you should get better results

This is my process. 1. Print out the drill template with 100% sizing 2. cut it out on the lines 3. fold down the sides and tape it to the box 4. if it is not exactly the right size when taped to the box do it all again 5. carefully (with my eyes this means with a bench magnifier) centre punch...