Maybe the stompswitch is soldered into the board turned by 90 degrees by mistake.
Unsolder the connections to the board and see if the dimmer effect of the LED still occurs.

That's a strange fault, does it look like anyone has messed with it? Also pics of the the board would help. If I had to venture a guess I would say Wampler's Tweed '57 That was also my first assumption, but the comparison of the pictures shows that the PCB on the Wampler pedal looks different than ...

It is true that the upper frequency limit decreases with the load at the output. But not only that the input resistance is also dependent on the load and also decreases. I found the output resistance of the Cornish buffer to be 545 ohms. The input is resistance 143 kiloohms @ 1kHz at 545 Ohms load. ...

Hi Grrrunge!

The RC break frequency over the 1n/7K5 junction is around 4.5kHz.

What makes you think that, I cannot follow?
The input resistance of your buffer circuits are ~210 Kiloohms @ 1kHz

This is the frequency response of the Cornish Buffer circuit found by circuit simulation.

f you redraw the arrangement of the components of the Cornish Buffer you will see that it is a so-called bootstrap circuit. This circuit provides a higher input impedance, with these component values about 1.6 Megaohms @ 1kHz. If you omit the C3 electrolyte, the input resistance drops to about 180 K...

Not only that phaser vibrato article but the whole magazine is quite a good read! Amazing what a good magazine Elektor used to be in the 2nd half of the seventies and the eighties compared to the dullness it is today. Indeed, it was a good magazine over the years. I read it monthly from its first p...

In this magazine you will find a phaser vibrato project with the TDA1022:

Hi Strato56,
many thanks for the shots.

Hey Modman, the same thing happened to me.
As I mentioned in an earlier post, I had once ordered N-channel JFets, the imprint was correct but they were P-channel JFets.
Since then I let the fingers away from these semiconductor sources.

Great!

Since the topic has now been reopened, I remembered the REDBOX which I bought a long time ago on the Internet. Unfortunately, this is defective and I had started to degoop this but for other urgent reasons ended and forgotten. Now I have digged it out again. Does anyone have shots of a PCB that was ...

I made this PCB clone. Waa Waa pedal HE 11-1978 02 PCB.JPG Ready-to-print PDF-files: Waa Waa pedal HE 11-1978 02 PCB Top.pdf Waa Waa pedal HE 11-1978 02 PCB Bottom.pdf Sprint-Layout6.0 file: Waa Waa pedal HE 11-1978.zip Gerber & Drill files: Waa Waa pedal HE 11-1978 Gerber & Drill.zip

Here is the breadboard layout according the circuit from my post above.

Here, for example, the gain calculation with the values determined from the data sheet curves. These curves are only valid for a 2N5457 with a Vgs-off of -1.2 Volts. This results in a maximum gain of 0.45 mA/V * 22 kOhms = 9.9 with bypass capacitor without series resistor of 9.9. With the series re...

This is only possible for the desired LED display with an additional auxiliary circuit as shown. Got it. I'm gonna need to look into this then. I don't have much experience with electrical components. Any advice on where to start researching? You should look for an electronics basics course for beg...

I am sorry, I had the inverse logic in the wiring of the outputs circuit.
I have corrected the wiring diagram and replaced correct one with the wrong one in the post above.

This circuit does not work.
You cannot mix AC voltage and DC voltage.
DC current of LEDs cannot flow through the capacitors.
The switching functions of signal and switching functions must be separated.
This is only possible for the desired LED display with an additional auxiliary circuit as shown.

As already posted, please measure the DC voltages at the terminals of the 2N5457.
From this you can see if the installed JFET matches the used Rs and Rd and also determine Yfs of this approximately.
Also, an estimation of the values of Rd and Rs for an adjustment of these is then possible.

Here, for example, the gain calculation with the values determined from the data sheet curves. These curves are only valid for a 2N5457 with a Vgs-off of -1.2 Volts. This results in a maximum gain of 0.45 mA/V * 22 kOhms = 9.9 with bypass capacitor without series resistor of 9.9. With the series res...