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Dear God, you can't rotate the pic on your phone? :LOL: We're talking about R3 & R4, yes? Opamps need a DC bias source for every input pin. In other words, every input pin must have a DC path to somewhere. The output of that opamp, or another opamp, or GND or Vref, whatever is appropriate...

I think we've wandered far enough off topic. ;)

In theory, yes. And it might work in some cases. Do you ever wonder why Boss & Ibanez put buffers before and after their FET switches?

Nope. But they can be purchased in an SMD package. So can a 555.

CD4053 is not a perfect switch. One has to consider on-resistance, off isolation, linearity, crosstalk and charge injection. They can and have been used successfully when applied correctly. They are more reliable than relays, although a relay does not significantly impact the reliability of a...

The BJT is there to help filter the signal going to the CLK pin. Personally, I think that design has a weakness in that any switch noise or chatter can clock the 4013 more than once and leave the relay in a random state. The 555 and 40106 circuits both have a hold-off function built-in. Once...

It really depends on which relay you're using. IF you're powering the 555 on 9V, and IF the relay coil current is <20mA, THEN the 555 has sufficient margin. Not a lot of margin, but enough. One could always add a MOSFET to a 555 to get more relay current capability.

Here's another. Two of the unused gates can be used to construct a 2nd relay driver, if needed.

Maybe make R19 a trimpot. In the Deluxe Reverb, R19 is 6.8K, so it's a matter of personal taste.

1. If we install a 9V reg and want the option to run on 9V, then it must be an LDO (low-drop-out) reg. A 78L09 will not make anything close to 9V if it's powered by 9V. 2. If you're referring to the schematic in post #1, then yes it is designed to be connected to the power input jack. The...

Yes.

It's the typical Marshall MID control. Fairly subtle and interacts with the TREBLE knob. It has the most effect when BASS & TREBLE are turned up.

A minor update. I moved D3, changed it to Schottky and added R16. Now it makes that special grind at low gain settings that HamishR likes so much.

The 2SK209 datasheet does not show a thru-hole device, only SMD. The 2SKxxx thru-hole devices I'm familiar with all have the gate on the middle pin. I see what you did there with the switch. Not sure it's necessary, but it does no harm.

Another OD inspired by HamishR down under in Perth. His earlier versions had four JFETs and a different tone stack. I took one of the later versions, deleted a source-follower stage between the clipping diodes and FMV tone stack, fiddled with the EQ and clipping a bit and here's where I ended...

My maternal grandmother was born and raised in New Brunswick.

Imagine what it's like living south of the border. Hooray for Canada's New Citizenship Act Bill C-3.

Tariffs are not about protecting American businesses. They are about market manipulation.

Here's the Luna Fuzz mod. Ref des match the GPCB Build Docs. Some part numbers / values changed, a few parts deleted. Compare the two schematics to see what I did. Watch the pinout when installing Q3.

I think it will but you should try it and see for yourself. The point of the anti-pop resistor(s) is to ensure that all of the caps are charged to the same DC voltage before they are switched into the circuit. That means that Ca & Cb each need a resistor.