Search found 340 matches

by plush
14 Sep 2020, 12:01
Forum: Amplifiers
Topic: power amp for Eleven Rack?
Replies: 6
Views: 235

Re: power amp for Eleven Rack?

Wanna build new one from scratch - go for IcePower mono or stereo module. They have both integrated AC to DC converter with aux power and very clean D-class output.
by plush
25 Aug 2020, 18:58
Forum: Pedal Debugging & Troubleshooting Support
Topic: Bogner Burnley pedal not working well
Replies: 3
Views: 115

Re: Bogner Burnley pedal not working well

I believe something is wrong with the input stage. Anyway, it'll require careful degooping. Yes, that is my understanding too. I can remove the black circuit cover with a dremel, the pedal is not under warranty. Be careful, there should be some sort of goopy compound inside, which can be very diffi...
by plush
25 Aug 2020, 17:41
Forum: Pedal Debugging & Troubleshooting Support
Topic: Bogner Burnley pedal not working well
Replies: 3
Views: 115

Re: Bogner Burnley pedal not working well

I believe something is wrong with the input stage.
Anyway, it'll require careful degooping.
by plush
24 Aug 2020, 14:45
Forum: Ready-To-Build Effect Projects
Topic: BAJA guitar preamp /buffer with switchable treble boost
Replies: 9
Views: 923

Re: BAJA guitar preamp /buffer with switchable treble boost

toefish wrote: 24 Aug 2020, 14:21 Hi,

What, if anything, would need to be changed to make this work with 12VDC instead of 9VDC?
You don't have to change a thing in a current state.
by plush
17 Aug 2020, 18:35
Forum: Pedal Debugging & Troubleshooting Support
Topic: Boss FBM-1 Bassman help please?
Replies: 3
Views: 206

Re: Boss FBM-1 Bassman help please?

Fuzzlefty77 wrote: 17 Aug 2020, 14:58 Best gut shots I can get without fully disassembling:
Ok, now you should look for what's getting hot. Also pls check Q17 pins, looks like a cold joint on pin 5.
Do also check other ICs for visual damages - cracks or small holes like this
by plush
17 Aug 2020, 12:56
Forum: Pedal Debugging & Troubleshooting Support
Topic: Boss FBM-1 Bassman help please?
Replies: 3
Views: 206

Re: Boss FBM-1 Bassman help please?

Getting hot - means a short / component failure. You can locate what is getting short pouring some IPA over the working board.
Dead shorts can be located with a dmm. Using lab PSU with current limiting will help not to destroy your pedal.

Post guts.
by plush
13 Aug 2020, 21:36
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Chorus 690 clock distorted output, not pulse
Replies: 15
Views: 557

Re: Chorus 690 clock distorted output, not pulse

Zack-stomp wrote: As far as audio path goes, I see it happily going into the SAD512 and then gets lost.
5106 is not a drop-in replacement, it has lower voltage rating (up to 13v only), while 512 works with 15. You might have killed your 5106 which is VERY SAD (king of puns, ay lmao).
by plush
13 Aug 2020, 19:02
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Chorus 690 clock distorted output, not pulse
Replies: 15
Views: 557

Re: Chorus 690 clock distorted output, not pulse

Zack-stomp wrote: this "on" blip should do it, eh? I'll test more with that in mind.
What do you mean "on" blip" ?
by plush
13 Aug 2020, 06:14
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Chorus 690 clock distorted output, not pulse
Replies: 15
Views: 557

Re: Chorus 690 clock distorted output, not pulse

Zack-stomp wrote: Thanks. But what if I tested with the SAD removed? I did, with the same results.
If you re getting the same modulated pulse from clock, then it's ok.
Try running the clock circuit in any simulator, you'll find out that everything is as it should be.
by plush
12 Aug 2020, 19:12
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Chorus 690 clock distorted output, not pulse
Replies: 15
Views: 557

Re: Chorus 690 clock distorted output, not pulse

That pulse waveform is correct for SAD512 since it has a clock divider which will provide the 2 out of phase clock signals internally.. It's the same waveform you'll find in MXR micro flanger or chorus of the same period. You might as well swap 4001 chip just in case, but I really think this is ano...
by plush
02 Aug 2020, 18:05
Forum: Boutique Stompboxes dissected...
Topic: Fairfield Circuitry - The Unpleasant Surprise
Replies: 29
Views: 8764

Re: Fairfield Circuitry - The Unpleasant Surprise

turbofeedus wrote: 02 Aug 2020, 17:08
bugg wrote: 02 Aug 2020, 15:43
turbofeedus wrote: 02 Aug 2020, 13:31 Yeah, not sure. Maybe they've forgotten about it? Could just buy the PCB and trace it I guess.
Sorry about the delay, try it now. :D
Word, thanks Bugg. Did you record the collector voltages for Q1 and Q2?
Q1 and Q2 are jfets...
by plush
01 Aug 2020, 09:50
Forum: Boutique Stompboxes dissected...
Topic: Zvex - Seek Trem [traced]
Replies: 2
Views: 390

Re: Zvex - Seek Trem [traced]

Hi

Schematic states that 4017N is used, which can't be the case, since 4017N can only withstand 7v max.
4017 should definitely have a diferent index...
by plush
28 Jul 2020, 07:45
Forum: Pedal Debugging & Troubleshooting Support
Topic: DOD FX51 Juice Box help and schematic.
Replies: 1
Views: 147

Re: DOD FX51 Juice Box help and schematic.

Hi I recommend you to use other DOD chematics for reference, they all share the same (+/-) switching circuit - 4007 inverter for a flip-flop switch, that controlls a couple of Jfets to pass or block a signal (in some cases it can be a jfet+npn transistor, jfet is used for switching, npn for somethin...
by plush
27 Jul 2020, 11:42
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Jordan bosstone original transistors?
Replies: 1
Views: 259

Re: Jordan bosstone original transistors?

BMS1971 wrote: 27 Jul 2020, 10:35 Hello
Almost all schematics out there are quite vague about the originals transistors on the Jordan fuzz bosstone box. Any clear info?
Cheers
Benoît
Different versions + different transistors.
I know for sure that they've used 2n2926 and 2n3397s in some of them.
by plush
25 Jul 2020, 11:12
Forum: Pedal Debugging & Troubleshooting Support
Topic: MT-2 Metal Zone Oscillating
Replies: 4
Views: 233

Re: MT-2 Metal Zone Oscillating

So no dice... I have checked the circuit .. Four times ive redone it. Ive switched breadboards, transistors, op amps, and still end up with the same result. It's kinda mind boggling. Mabey the 250+ gain is too much and I need to build the rest of the circuit so that the EQ section might tame it but...
by plush
25 Jul 2020, 06:48
Forum: Electric Guitar Rewiring
Topic: Reduce Wiring Noise: Avoid Magnets
Replies: 14
Views: 1388

Re: Reduce Wiring Noise: Avoid Magnets

I get really confused when you guys keep talking about electric and magnetic fields as if they were separate things, because every flow of electric current creates a magnetic field. They're the same. You can talk about a static or flowing current of a field as being different, but they're all magne...
by plush
21 Jul 2020, 17:19
Forum: Electric Guitar Rewiring
Topic: Reduce Wiring Noise: Avoid Magnets
Replies: 14
Views: 1388

Re: Reduce Wiring Noise: Avoid Magnets

JiM wrote: 21 Jul 2020, 15:05 If those wires were shielded, the current would have been induced in the shield and dumped to ground.
But why? Magnetic field would penetrate the copper shield and induce current in both signal and ground wires.
by plush
21 Jul 2020, 14:16
Forum: Electric Guitar Rewiring
Topic: Reduce Wiring Noise: Avoid Magnets
Replies: 14
Views: 1388

Re: Reduce Wiring Noise: Avoid Magnets

the main reason a current is induced in the coil is the perturbation of the magnetic field of the magnet by the moving string. This. I was a kinda wrong with my representation, thanks. Still, I can't find any significant magnet field capable of inducing parasitic current into unshielded wire mess u...
by plush
21 Jul 2020, 08:37
Forum: Electric Guitar Rewiring
Topic: Reduce Wiring Noise: Avoid Magnets
Replies: 14
Views: 1388

Re: Reduce Wiring Noise: Avoid Magnets

I believe it works the same as the pickup does generally: a coil of wire in a static magnetic field. Various other magnetic fields, AC noise, etc... interact with that static field and induce the noise into the coil of wire. What I'm saying is that I think the leads behaved as a secondary pickup th...
by plush
21 Jul 2020, 06:50
Forum: Electric Guitar Rewiring
Topic: Reduce Wiring Noise: Avoid Magnets
Replies: 14
Views: 1388

Re: Reduce Wiring Noise: Avoid Magnets

What type of guitar and pickups are we talking about? Could a lack of of shielding under the pickups be the cause?

I can't really tell how fixed magnetic field can make wires under the pickup "more sensitive". If the field were altternating, then - yes, it'd induce some current.