Search results

In other news, I tried various JFETs for Q1 & Q2 in simulation. Most of the ones I tried (MPF4393, J113, 2N5246, 2N5457, 2SK117, BF244A) cut off quite a bit of treble due to their higher Miller capacitance. 2N5484 worked about the same as J201, but required a larger value for R8 (470Ω) to get...

4.3V is inconclusive. Let's try that measurement another way. + probe on Q2-S, - probe on the end of R4 that isn't grounded. With Q2 Idss > Q1 Idss on my breadboard, then with a 3.7Vp-p signal at Q2-S, the waveform is very symmetric with just a touch of 2nd harmonic (about 3%). If I swap Q1 &...

Pretty nice. I wouldn't call it a Fuzz, more of an OD in my book. Goes from clean to mild distortion to OD. No EQ and it doesn't seem to need it. The BIAS knob doesn't do a whole lot. It's pretty much set and forget. There's one fairly wide sweet spot from . Won't gate. If anyone has a...

This one has been getting good reviews and demos; here's the breadboard. Built per spec except I subbed BC337-25 for Q4. Q1 & Q3 Idss is around 335μA. Q2 Idss is around 520μA. Q1 & Q2 idle around 330μA. R8 is so low that Q1 runs very close to Idss. Q3 idles around 210μA. The JFET specs...

OK, that's enough of that. What else can we fit on a mini breadboard?

Columbus was a dick. But he had a good PR guy. Looks like you have R1 wired correctly. Remove D1, that should not be there and could be causing all of the trouble.

Then you haven't had it long enough. ;) If you assume that ALL disk ceramic caps are garbage, you won't be far off. Besides being dirty, smelly & totally unprincipled*, they are microphonic, muddy and generally unreliable. * Monty Python's Flying Circus Prejudice Sketch

SMD & Ge on the same board is pretty remarkable. I wonder why they chose MP10B. I was looking for some on eBay, but the tariffs are a real buzz-kill. :mad:

Here's the proof from the tear-down video.

The thought hadn't occurred to me. The breadboard is quiet, so I think I'll leave Q1 as-is. Good question though. In this case, I believe DBA did the right thing with Q1.

It's a two-fer this week! This is the first Death By Audio circuit I've breadboarded. I've always thought their stuff was a little "out there" and this one is no exception. Before I built the breadboard, I listened to a demo on YaoTaob. Sounds pretty good. Definitely worth investigating. The...

TREBLE is a shelving control, just like the TONE control in the BD-2. Oh bugger! Schematics corrected.

This design was whipped up by HamishR, based on the BJFe Model G. Here's what he sent me. The main difference from the Model G is the clipping diodes. He used Schottky instead of LEDs for the soft clippers (D1 & D2); 1N4001 instead of JFETs for the hard clippers (D3 & D4). He deleted the C...

Are we still talking about resistors? ;)

Most Excellent

Ever try the Search function in these forums? The EQD Hoof uses two Ge trannies. Low HFE Si will work pretty much the same, but have less Mojo. https://forum.pedalpcb.com/threads/the-week-on-the-breadboard-eqd-hoof-boneyard-mod.21830/

Yes. Be sure to change R101 & R102 to 10K.

OK, guys. Let's try to keep this thread on-topic. :cool:

This is a simple one. Often times we want a unity gain buffer and for a few reasons, don't want or need an accurate opamp model. The main reason is that an accurate opamp models contain a TON of parts (some, over 100) which slows down the simulation. Especially when you have several opamps in...

I posted a pic of this Leuchtenbergia Principis 8 years ago. It's grown a bit since then.