Search found 1483 matches

by Nocentelli
25 Feb 2024, 12:25
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Mutron - Bi Phase [schematic]
Replies: 13
Views: 25141

Re: Mutron - Bi Phase [schematic]

This is incredible - I've watched this show a couple of times, and it's usually "Grandma's terrible old painting (that has nostalgic value) has a rip in it" or "Help repair my late father's broken old guitar", and then, boom! ACTUAL Mad Professor strolls in with ACTUAL Lee "...
by Nocentelli
24 Feb 2024, 23:11
Forum: Amplifiers
Topic: Mend-It Mark's cap discharger [schematic]
Replies: 3
Views: 13947

Re: Mend-It Mark's cap discharger [schematic]

You can simply use any DMM with low-z function for such purpose. Yeah, or even just a resistor i guess - Just thought people might get a kick out of his (quite clever-looking) design and build. He really knows his stuff. In a tape deck repair he actually rewound the motor. There is not much seems t...
by Nocentelli
24 Feb 2024, 18:45
Forum: Amplifiers
Topic: Mend-It Mark's cap discharger [schematic]
Replies: 3
Views: 13947

Mend-It Mark's cap discharger [schematic]

A while ago, the you-tube algorithm started feeding me videos from Mend-It Mark, a general electronics repair guy of the archetype that I thought had all but disappeared years ago, even though he looks a bit younger than me. I got quite into watching the videos of his repairs when they pop up in my ...
by Nocentelli
25 Jan 2024, 17:57
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Boss - PN-2 Tremolo/Pan [schematic]
Replies: 12
Views: 10565

Re: Boss - PN-2 Tremolo/Pan [schematic]

madscijrjr wrote: 24 Jan 2024, 18:23 I'd also be interested in plans for an auto-pan pedal.
Did you ever find one?
This is the only DIY-friendly schematic i've found: It's the 4ms stereo panneur
schematic (1).pdf
(42.92 KiB) Downloaded 65 times
by Nocentelli
05 Jan 2024, 13:02
Forum: DIY Projects
Topic: Preamp/OD/fx and bluetooth transmitter?
Replies: 1
Views: 655

Preamp/OD/fx and bluetooth transmitter?

I've got a tiny usb-rechargable bluetooth boombox with an aux line-in socket and it sounds pretty good with a guitar plugged in. miniboom.JPG I want to try to make a smallish box i can plug my guitar into that will send the (boosted, slightly overdriven and with a level-out pot) guitar signal via bl...
by Nocentelli
03 Jan 2024, 17:46
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Biasing Q1 in a Fuzz Face... who does it and is it worth it?
Replies: 7
Views: 1550

Re: Biasing Q1 in a Fuzz Face... who does it and is it worth it?

one of the mods jhs suggests in his video on the fuzz face is to replace the Q1 collector resistor with a 1 meg pot......
by Nocentelli
23 Sep 2023, 11:22
Forum: Boutique Stompboxes dissected...
Topic: JHS - Bender [traced]
Replies: 13
Views: 4064

Re: JHS - Bender [traced]

I like Josh's attitude towards things. The JHS website says it's a 1973 MKIII Tonebender the video of the whole range has him saying he spent ages trying and tinkering to get the Ge sound out of Si and after endless testing, it turns out that these two decades old schems had it exactly right back t...
by Nocentelli
19 Sep 2023, 17:54
Forum: Boutique Stompboxes dissected...
Topic: JHS - Bender [traced]
Replies: 13
Views: 4064

Re: JHS - Bender [traced]

I was interested in the way that he got "germanium sound from silicon transistors" :hmmm: should the alternative pot wiring be used? I suspect "mictester's" version should be used, since otherwise the gain pot setting slightly affects the bias. Is it correct that the switch bypa...
by Nocentelli
28 Aug 2023, 21:57
Forum: DIY Projects
Topic: 2CH Mixer audio Op amp voltage sum + buffer
Replies: 13
Views: 1290

Re: 2CH Mixer audio Op amp voltage sum + buffer

a non-inverting buffer would ordinarily have a large value resistor (1M / 470k) to a 1/2 supply bias voltage. I guess the low resistance (10k|| 10k) of the voltage divider might make a difference here
by Nocentelli
28 Aug 2023, 18:53
Forum: DIY Projects
Topic: 2CH Mixer audio Op amp voltage sum + buffer
Replies: 13
Views: 1290

Re: 2CH Mixer audio Op amp voltage sum + buffer

The first image shows the power supply and it is +9v and ground/0v like off a battery. The non-inverting input needs a reference of half supply, so around 4.5v which is supplied by that divider. However, in the second picture, no supply is shown: We have to assume, since the non-inverting inputs her...
by Nocentelli
28 Aug 2023, 16:30
Forum: DIY Projects
Topic: Dual output buffer/splitter design
Replies: 16
Views: 1892

Re: Dual output buffer/splitter design

Thanks for the input, everyone. After some slapstick soldering and a fubar vero, i ended up doing some sort of opamp-based design, works fine.
by Nocentelli
21 Aug 2023, 22:26
Forum: DIY Projects
Topic: Dual output buffer/splitter design
Replies: 16
Views: 1892

Re: Dual output buffer/splitter design

Yeah, radio frequencies. This came up coincidentally on DIYSB a couple of hours ago. Initial thread on the Cornish buffer with explanations: https://www.diystompboxes.com/smfforum/index.php?topic=124166.20 Isn't that page of discussion focused on the 1n B-E cap? I was referencing the 4u7 between em...
by Nocentelli
21 Aug 2023, 17:47
Forum: DIY Projects
Topic: Dual output buffer/splitter design
Replies: 16
Views: 1892

Re: Dual output buffer/splitter design

OK, I knocked this up based on the cornish buffer (i know you've done a pcb for it). I was unsure about biasing both transistors off the same single (120k) resistor without changing the value, but just went with it anyway. I have also omitted the 4u7 cap from emitter to vref, but I've not seen this ...
by Nocentelli
20 Aug 2023, 17:46
Forum: DIY Projects
Topic: Dual output buffer/splitter design
Replies: 16
Views: 1892

Re: Dual output buffer/splitter design

Two FETs is going to need roughly the same number of resistors and caps, but i think will make for a smaller/simpler vero, so i'm now looking at doing this: Dual FET buffer.bmp I've based it on the split 'n' blend circuit that IvIark did a vero for here - http://tagboardeffects.blogspot.com/2012/02/...
by Nocentelli
18 Aug 2023, 10:39
Forum: DIY Projects
Topic: Dual output buffer/splitter design
Replies: 16
Views: 1892

Dual output buffer/splitter design

I am going to build a little splitter box to send two copies of the same mono signal chain to sample into the left, right or both channels of a stereo chain consisting of BOSS DD7-> zoom CDR-70 -> DITTO X2. I'm using a WOBO dual looper to route the signals For the actual buffer, I was just going to ...
by Nocentelli
27 May 2023, 15:03
Forum: Boutique Stompboxes dissected...
Topic: J. Rockett Tim Pierce signature OD (traced)
Replies: 34
Views: 7306

Re: J. Rockett Tim Pierce signature OD (traced)

sbdtoni wrote: 27 May 2023, 11:04 1,5k the position is put in the 2 pin of the potientomether of Tone right?
It's not quite the same because the Timmy is DC coupled between two opamp stages, but you'd put the 1k5 between the output cap C11 and pin 3 of the tone pot
by Nocentelli
27 May 2023, 06:22
Forum: Boutique Stompboxes dissected...
Topic: J. Rockett Tim Pierce signature OD (traced)
Replies: 34
Views: 7306

Re: J. Rockett Tim Pierce signature OD (traced)

How high is the gain set in your video? Does this noise occur only at higher gain or at all settings? One issue could be the lack of limiting resistor before the tone cap: You'll see the Timmy has a 1k5 (?) resistor between the tone pot and the tone cap-to-ground. This prevents the first opamp havin...
by Nocentelli
04 May 2023, 16:27
Forum: Parts & Tools Sourcing & Trading
Topic: Alternative RAT 2 potentiometers
Replies: 6
Views: 1294

Re: Alternative RAT 2 potentiometers

Eet3m wrote: 04 May 2023, 00:11 I'd like to swap one of them out for a 50k pot.
Can't seem to find one that looks similar on any of the websites I'm familiar with.
Thanks!
Are they not all 100k pots? Could you stick a parallel 100k across the lugs or is the taper important?
by Nocentelli
01 May 2023, 14:53
Forum: Boutique Stompboxes dissected...
Topic: Creepy Fingers Lonely Heart Fuzz
Replies: 12
Views: 2692

Re: Creepy Fingers Lonely Heart Fuzz

.......distortion level. It's either on or off. However, you can control this by putting variable resistors between C3 and ground and C5/R13 and ground. According to my LTSpice models, about 1K gets you more of a crunchy overdrive. Let us know how your breadboard experiments go! That's what i meant...
by Nocentelli
30 Apr 2023, 08:17
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Electra MPC Module Schematics [schematic]
Replies: 25
Views: 13307

Re: Electra MPC Module Schematics [schematic]

So none of these actually match the Electra Distortion schematic that is commonly available - interesting... Has anyone actually seen a version of the Power Overdrive with the additional diodes or a Tube Sound matching the Distortion schem that we've all seen? :? Mystery solved: https://www.diystom...