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Pretty much. On both counts. :LOL:

I wanted a rail-to-rail opamp for the clipping stage. CA3130 was the best choice I had at the time. I've since found another potential candidate and it comes in a dual. As for clipping tone, the TL072 is pretty good if biased correctly. But it has a lot less headroom compared to the CA3130.

Sure you could do that and it would work. I had a spare opamp so I put it to work. As for why Peter Rutter put an output buffer on the Dragon, you'd have to ask him.

It's nothing like a Fuzz Face or Big Muff. It's a rather unique circuit. Q2 bootstraps Q1's collector via R4, except when GAIN is dimed. Boostrapping effectively raises the impedance of R4 which increases Q1's gain. Q3 loads Q2's emitter. At low to medium GAIN settings, Q3's input...

Given how many BMP variants there are, I'm not sure there is a "usually." All B-taper is pretty common, especially among the early Muffs. Before you pull those pots off, try it as-is and see if you like it. You may only need to change the VOLUME pot.

"...organized for your physical submission." I went on a job interview at a small electronics firm in Santa Monica. They had a beautiful office space with windows all around. They had just been bought by CitiBank and the offices were being relocated to bleak, nearly windowless warehouse type...

Music In Your Mouth at CES. Songs I'd like to see them put in a Lollipop: Booker T & the MGs - Green Onions George Thorogood - One Bourbon, One Scotch and One Beer Beatles - Mean Mr. Mustard King Crimson - Cat Food Led Zeppelin - The Lemon Song Cream - Toad ZZ Top - Tush Green Day's entire...

Anyone consider making PCBs of this?

Looks to me like the low resistance end of the scale changes rapidly with each increment in rotation. In the circuits I design that use A- or C-taper, I want the low resistance end of rotation to change slowly. The only difference in the way I apply A- and C-taper is whether I want the slow...

I can answer this two ways: 1. When we connect an A-taper pot as a variable resistor, we use pins 1 & 2. We can ignore the fact that we usually connect pin 2 to pin 3 because it has no effect on the overall resistance. Clockwise rotation increases resistance. But when we connect a C-taper pot...

In this part, we'll discuss what happens when we put a resistor in parallel with a pot. We'll address the simple case where we use the pot as a variable resistor (as opposed to a variable divider) where we connect two pins together. The first example is a B-taper pot. We'll connect pins 1 & 2...

So how do know which taper to use? It really comes down to how the circuit responds when we turn the knob. For the most part, A-taper is good for GAIN and VOLUME knobs where we want to be able to easily access settings over the full range of rotation. Examples: The maximum output from a TS is...

There are a lot of misconceptions floating around regarding pot tapers and parallel resistors, so I thought I'd make an attempt to clarify things. I'll explain how to read the pot taper charts in the Alpha datasheet, how the circuits react to pot taper and resistance, how to select a pot taper...

I think it's only fair that Venezuela should do us a solid and return the favor.

When one returns significant currents to Vref, one must make Vref very stiff. Large caps, small divider resistors or an opamp buffer are required. The ODR-1's clipping diodes, VOLUME pot and a couple other nets feed AC current into Vref.

You did the right thing. C8 was a typo on my schematic (now corrected, above.)

It's there, you have to zoom way in.

Why would you even consider buying premium opamps on eBay? I looked at it for 20 sec and IC1.1 can be driven to saturation if DIRT is turned up high enough. So can IC1.2. The OPA2604 datasheet does not tell us what happens if the inputs are driven close to the rails. Some of the OPA JFET...

That's a BJT and as such is not a sub for any JFET BF256B will have lower gain. J113 is a better sub and readily available. Adjust R4 and/or R12 in accordance with post #106.

NIIIIIIIIIIIIIIIIIIIIIIIIIIIIIICE!