Phew, February has been a wild month here on the blog so lets end it with a BANG. This one is based on Tim Escobedo's DIY classic, Ugly Face with quite a few added bells and whistles such as a optical LFO section, separate starve control for two of the chips and some tweaked values here and there.
Schematic is avaiable HERE.
Traced by Unsound Circuitry, once again, thanks, mate!
It is a well known fact that this is a modified Ge Fuzz Face. The stock Fuzz control is ditched and replaced with a "Pre Gain2 control. It runs on normal power supply and is powered by soviet MP37B NPN germanium transistors. These are usually faily low gain and the current leakage is low. The bias trimpot is placed on the side of the board for easy moddong for an external bias pot.
There was an old unverified layout in the library that I wasn't too fond of. So here is a new one!
Schematic is avaiable HERE.
Here is a forgotten oldie that has been requested ever since Colorsound released a small run of replicas in the fall of 2023. Dharma Sound was a small operation builder from Kent, OK, active in the 70s.
The circuit design is pretty interesting; first a BJT input buffer. Then the signal is split into two parallel active fixed filters. The signal is then joined together before it hits the LM741 op amp with stacked clipping diodes to generate distortion. . Sound clips suggest that it sounds like a distortion with a cocked wah tone.
Schematic is avaiable HERE.
Oh, and this is post #1500!
*Edit 24221* Verified by Henrik.
Schematic is aviable HERE.
Modified for true bypass since most people in here seem to prefer it over buffered bypass.
Schematic is aviable HERE.
Verified by NJGTR. Thanks mate! He also spotted some errors which now is corrected,
There was a request for 4ms Tremulues Lune with two LFO's but couldn't find a schematic for it. So we're stuck with the normal version. But for this layout I've incorporated an input buffer found in their "Luna" project. Schematic is aviable HERE as well different ways to wire up the rate LED and the bypass LED.
Per request.
This one was a PITA to draw with its four dual op amps and two buffered Vref lines. So it didn't came out 125b friendly and it has more links than I prefer...
Schematic is avaiable HERE.
Schematic is avaiable HERE.
*Edit 240216* wyongroadelelectroncs verified this layout. He also noticed that the Bass and Mid pot connections was is incorrect in the linked schematic. The Layout is updated and tagged.
Another layout and a dsign for those like it heavy by Chris at CDC Fx. No blurb from me, Chris does it better:
Things are rainy and depressing here in California. And also depressing
in the world, in general. So I've been drawing more layouts.
I was inspired by both the Dead Air Sawzall, and the layout another
Dirtbox user submitted to you under the name "Glass Jaw" - with a Bax EQ
in the middle of the two LM386 stages of the Acapulco Gold.
So I came up with a modified Acapulco Gold circuit with a better gain
control (instead of the common mod of a 1m pot on the input, this one
adds up to 10k of resistance between pins 1 & 8 of the 1st LM386)
and "sandwiched" (hence the name, hah) an HM-2-style EQ in the middle of
the two stages. I'm also running this at just under 18v with the
onboard charge pump. The result (I just built it, so it is verified!) is
a a pretty versatile amp-in-a-box with Sunn tonality and a switchable 3
band EQ! Not at all "chainsaw" but really cool sounding nonetheless!
The TO-92 18v regulator is probably unnecessary, since the TL082 can
handle more than that easily, but the LM386-4 is rated to max 18v and I
didn't want to risk damaging them.
A modified and improved Hornby Skewes silicon Zonk 2 that goes for big bucks.
Schematic and a breadboard session(!) is avaiable HERE.
It seems that silicon transistors in the 150-200 hFe range works best in this circuit.
*Update 240203* Reeves Electro got in touch with Gray Bench since two of the pot values was incorrect in the trace. Layout and schematic is updated.
