Three new circuits

idsnowdog

Imperator of Indignation
Anarchotone - This started as a Sam Ash Astrotone clone but diverged early on. The diode clipping section had two large value coupling capacitors that I couldn't see the point of. I also couldn't see the point of having such a great sounding front end going into a wimpy sounding output buffer which lowered the output too much. So it's basically the first half of the Astrotone with a different clipping section, and a JFET output stage. The output stage is a standard JFET amplifier that overdrives nicely when pushed hard. The output stage has a Cascode Germanium transistor on a switch for a little extra output and overdrive.

Green Ripper - This is a clone of the Dan Armstrong Green Ringer. I didn't modify this circuit too much. I socketed the transistors because the 2N5089s called for were too high gain. I went with a 2N3904 in Q1, a Germanium transistor in Q2, and a 2N5089 in Q3. The Germanium clipping diodes called for didn't sound very good so I used UV and green LEDs for the clipping stage. The LEDs have a much fuller sound and don't lower the output too much. The original doesn't have any controls. I added the nulling pot mod to accentuate the ring modulator tones, a gain control on Q1 to lower the amount of overdrive from that stage, and a volume pot. I wasn't able to get as wonky sounding ring modulator tones as the demos I saw. However, it does have a demonic sounding lead tone that produces wooly overtones as it decays.

Swamp Kitten - This is a Heathkit TA-28 fuzz clone. The demos I have heard were pretty crappy sounding so I took that as a challenge to rework it into something I like. I was intrigued about the idea of a low voltage power rails clipping circuit. Like a lot of pedals the person who designed it probably never played guitar. At first I thought there must have been a secret strategy to its design but there wasn't any magic in the original component values. The strategy seemed to be to use large value capacitors to create a dark and thick sounding fuzz and then put an input control in front and a tone circuit after it to try and fix everything wrong with it. Architecturally I didn't diverge too much from the original design except removing the tone circuit completely. I was able to create a perfectly balanced sounding fuzz just by changing the capacitor values. It sounds great with every guitar I tried. The result is a thick and heavily compressed fuzz with a little bit of gating. The gating effect responds really well to palm muting and when I roll back the input pot the tone goes from thick and dark to bright and growly. It's also surprisingly loud for only 1.5 volts.
 
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sounds like some fun projects! i havent heard a green ringer in forever. a buddy had a bunch of those dan amstrong plugin things, orange squeezer, blue clipper, green ringer, and i think one more that i cant recall. is the anarchotone more of an overdrive or a fuzz?
 
sounds like some fun projects! i havent heard a green ringer in forever. a buddy had a bunch of those dan amstrong plugin things, orange squeezer, blue clipper, green ringer, and i think one more that i cant recall. is the anarchotone more of an overdrive or a fuzz?
The Anarchotone is a distortion with some fuzzy characteristics. Tommy Bolin used an Astrotone. The first half of the circuit including the hard clipping diodes is pretty much an Electra Fuzz which many other distortion circuits use as a starting point. The difference with the Astrotone is the clipping diodes are between two transistors. Someone told me the capacitors before and after the clipping diodes is some kind of bias circuit. I couldn't get the bias on the two transistors set and I thought the output stage was weak so I did my own thing instead.

ashfuzzschem.gif
 

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This is the Swamp Kitten's schematic. Architecturally it is largely the same but with different values. I didn't have 2N3391s or X29A829s so I used a BC546 instead. The second is an unmarked silicon PNP transistor. The case is from some sort of AV equipment. All the holes are in the right spots and I have been able to salvage components from the circuit. The Anarchotone is on the left and Swamp Kitten on the right.
 

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