Search found 374 matches

by mmolteratx
16 Nov 2014, 20:08
Forum: Boutique Stompboxes dissected...
Topic: Rockett WTF Fuzz [traced]
Replies: 18
Views: 13530

Rockett WTF Fuzz [traced]

Found this picture online and decided to figure out what it was. The two 560k resistors were a dead giveaway that it was Bosstone based, so I figured I'd fill in the blanks. Not sure if this is 100% accurate (and I'd hazard a guess that it isn't since I don't know what the value of the Epcos cap and...
by mmolteratx
18 Oct 2014, 16:45
Forum: Boutique Stompboxes dissected...
Topic: Telenordia - TA-100 [traced]
Replies: 18
Views: 9471

Re: Telenordia - TA-100 [traced]

Q1 is unknown. It's in a flanged package like the AC128s, so it's a germanium, but it isn't labeled, and an NPN would make more sense in that position based on the values, IMO. Based on the voltages I would say it was a PNP, 200mV is consistent with it being germanium PNP. If it were NPN a VBE of 5...
by mmolteratx
18 Oct 2014, 04:11
Forum: Boutique Stompboxes dissected...
Topic: Telenordia - TA-100 [traced]
Replies: 18
Views: 9471

Re: Telenordia - TA-100 [traced]

Accidentally broke the drive pot on mine and opened it up to repair tonight. Figured I should probably reverse it while it was open. Build quality is great, but TBH, it sounds like complete ass with the drive knob above 3 o clock or so, and it doesn't have much gain below that. Not worth the new pri...
by mmolteratx
04 Sep 2014, 20:16
Forum: Ready-To-Build Effect Projects
Topic: (512)ae Inamorata Fuzz
Replies: 16
Views: 1317

Re: (512)ae Inamorata Fuzz

Here's the drunk one I mentioned earlier. Recorded through a DSLR mic, so sound quality is shit, but you sort of get an idea. I guess I forgot I was supposed to be showing off the range for about the first minute, so whatever. :lol: Skip to around 2:00 for lower(ish) gain tones. Wound up lowering th...
by mmolteratx
04 Sep 2014, 03:55
Forum: Ready-To-Build Effect Projects
Topic: (512)ae Inamorata Fuzz
Replies: 16
Views: 1317

Re: (512)ae Inamorata Fuzz

And non inverting as promised. This one has a tad bit more range in the focus control, but it's not a huge difference. Just used 68n for C3 because I didn't have an 82n on hand and I never changed it. Just in case my testing was flawed, I recommend this for your own build, unless you really need the...
by mmolteratx
03 Sep 2014, 21:05
Forum: Ready-To-Build Effect Projects
Topic: (512)ae Inamorata Fuzz
Replies: 16
Views: 1317

Re: (512)ae Inamorata Fuzz

... I still say that despite the noise difference on paper, the inverting design isn't that much noisier in practice and is still quite a bit less hissy than any of the straight Big Muff clones I have around at the same gain levels. That's interesting :scratch: ! ... the actual sound is far more im...
by mmolteratx
02 Sep 2014, 17:35
Forum: Ready-To-Build Effect Projects
Topic: (512)ae Inamorata Fuzz
Replies: 16
Views: 1317

Re: (512)ae Inamorata Fuzz

That 470K input resistor is gonna give you lots of noise/hiss. Why don't you just use a non-inverting stage? For the first part, we're talking sqrt(4*k*T*R), which gives ~88nV for a spectral power density. Even integrating across the audio bandwidth doesn't give you significant noise. After buildin...
by mmolteratx
01 Sep 2014, 22:09
Forum: Ready-To-Build Effect Projects
Topic: (512)ae Inamorata Fuzz
Replies: 16
Views: 1317

Re: (512)ae Inamorata Fuzz

That's a great looking build! Kudos Matt! ;) Funny thing with the timmy/zendrive-alike bass cut on the first op-amp stage. I've been playing around with the exact same thing for ages :D How does it sound? Yea, I use it up front in pretty much every OD/distortion/fuzz I build. Super useful for setti...
by mmolteratx
01 Sep 2014, 16:48
Forum: Ready-To-Build Effect Projects
Topic: (512)ae Inamorata Fuzz
Replies: 16
Views: 1317

Re: (512)ae Inamorata Fuzz

That 470K input resistor is gonna give you lots of noise/hiss. Why don't you just use a non-inverting stage? For the first part, we're talking sqrt(4*k*T*R), which gives ~88nV for a spectral power density. Even integrating across the audio bandwidth doesn't give you significant noise. After buildin...
by mmolteratx
01 Sep 2014, 06:13
Forum: Ready-To-Build Effect Projects
Topic: (512)ae Inamorata Fuzz
Replies: 16
Views: 1317

(512)ae Inamorata Fuzz

Was planning on offering up a few circuits I've been screwing with for a while for sale, but with grad school applications fucking with my free time for the next few months, that could be a ways off. So I've decided to offer them up here in the mean time for DIY'ers, and may be down for selling PCBs...
by mmolteratx
31 Aug 2014, 06:13
Forum: Boutique Stompboxes dissected...
Topic: Vertex NOS Axis Wah - De-gooped [traced]
Replies: 27
Views: 11944

Re: Vertex NOS Axis Wah - De-gooped - [Traced] [traced]

Correction : Lug 3 not Lug 1 on the Body/Q Pot: "Although LUG 3 on the "Body" or "Q" pot is not connected to anything in either the BBE or the Vertex". Not that it really matters from a functional standpoint which 2 lugs you use on that pot, 1 & 2 or 2 & 3. Can...
by mmolteratx
19 Aug 2014, 00:15
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Visual Sound - Pure tone buffer
Replies: 8
Views: 7075

Re: Visual Sound - Pure tone buffer

Thanks for the schematic Bernard. I think we can assume C1 is 1n or less, if it's just to protect against RFI then you often see 100p in that position. C2 can be pretty much anything that won't start cutting low end in the filter and so 100n should do nicely. And the filter caps should be fine at 1...
by mmolteratx
17 Aug 2014, 04:38
Forum: Boutique Stompboxes dissected...
Topic: Wyllie Moonrock [traced]
Replies: 25
Views: 11287

Re: Wyllie Moonrock [traced]

Slightly different. I'll have to double check to see if the 1M attaches before or after the coupling cap from Q2 output. The diodes that go to Q3 are both in the same direction on mine, for sure, though. Not sure if that's true of both pedal examples. Maybe mine has a mistake. I dunno. That's the p...
by mmolteratx
17 Aug 2014, 03:41
Forum: Boutique Stompboxes dissected...
Topic: Wyllie Moonrock [traced]
Replies: 25
Views: 11287

Re: Wyllie Moonrock [traced]

I think c3 goes to ground. No, I traced that part, it doesn't go to ground. It should, but it also really shouldn't matter all that much since it blocks DC. Any steady reference should behave the same. I suspect it may have been easier to route it there on the board than to ground. EDIT: V, I meant...
by mmolteratx
17 Aug 2014, 03:29
Forum: Boutique Stompboxes dissected...
Topic: Wyllie Moonrock [traced]
Replies: 25
Views: 11287

Re: Wyllie Moonrock [traced]

I think c3 goes to ground. No, I traced that part, it doesn't go to ground. It should, but it also really shouldn't matter all that much since it blocks DC. Any steady reference should behave the same. I suspect it may have been easier to route it there on the board than to ground. EDIT: V, I meant...
by mmolteratx
17 Aug 2014, 02:22
Forum: Boutique Stompboxes dissected...
Topic: Wyllie Moonrock [traced]
Replies: 25
Views: 11287

Re: Wyllie Moonrock [traced]

Here's what I get out of the one i have using soggy's very helpful trace diagram as a guideline (I had some errors when I jotted it down originally but that made it a lot easier to sort out). [ Image ] I dunno, I'm no comprehensive circuit historian myself, but it doesn't look familiar to me. It's ...
by mmolteratx
15 Aug 2014, 04:58
Forum: Boutique Stompboxes dissected...
Topic: Walrus Audio - Mayflower [traced]
Replies: 45
Views: 23262

Re: Walrus Audio Mayflower [traced]

After being hit up by IVIark to see if I had done any more work on this, I cleaned up the schem and did a quick retrace. The original doesn't really do anything with the unused op amp half, but I included it tied to Vr, which is better practice. Result is attached.
by mmolteratx
14 Aug 2014, 19:36
Forum: Boutique Stompboxes dissected...
Topic: Dunlop - Eric Johnson Signature Fuzz Face EJF1 [traced]
Replies: 401
Views: 85663

Re: Dunlop - Eric Johnson Signature Fuzz Face EJF1 [traced]

http://www.peakelec.co.uk/acatalog/jz_dca55.html Is the shit for finding the pinouts/other characteristics of random transistors. It's a shame the device doesn't come with any standard sockets, or I would've ordered one. If say, you had to test a batch of 500 transistors, it would be a pain to have...
by mmolteratx
13 Aug 2014, 01:25
Forum: Ready-To-Build Effect Projects
Topic: A Switching Scheme
Replies: 247
Views: 31138

Re: A Switching Scheme

hey guys, I tried to build the relay true baypass layout for momentary switch, and funny thing happened, it worked with a certien power suplly but not with any other,,, i tried it with 5 diferent regulated power suplies and only the led worked, the relay wouldnt switch but with one specific dc powe...
by mmolteratx
12 Aug 2014, 01:31
Forum: Boutique Stompboxes dissected...
Topic: Dunlop - Eric Johnson Signature Fuzz Face EJF1 [traced]
Replies: 401
Views: 85663

Re: Dunlop - Eric Johnson Signature Fuzz Face EJF1 [traced]

http://www.peakelec.co.uk/acatalog/jz_dca55.html

Is the shit for finding the pinouts/other characteristics of random transistors.