Search found 366 matches

by jymaze
13 Aug 2014, 13:55
Forum: Pedal Debugging & Troubleshooting Support
Topic: Wampler Ecstasy bass control
Replies: 54
Views: 6284

Re: Wampler Ecstasy

I would check/remelt all solder joints. Then the next step to me is to check for bad capacitors, first in the feedback loops, then elsewhere. Make sure that you have the right orientation for the electrolytic caps.
by jymaze
12 Aug 2014, 13:25
Forum: Pedal Debugging & Troubleshooting Support
Topic: Wampler Ecstasy bass control
Replies: 54
Views: 6284

Re: Wampler Ecstasy

Hello,

Do you get the same results with wall-wart and battery? Is it boxed?
by jymaze
03 Jul 2014, 22:37
Forum: ICs (Integrated Circuits)
Topic: Building A 4558 opamp from scratch.
Replies: 20
Views: 17512

Re: Building A 4558 opamp from scratch.

A discrete opamp has not much reason to sound better than an IC. If you don't like the sound of distortion of high gain / high feedback devices, then it will sound the same to you when distorting. You should try cascaded jfets designs if you haven't tried yet (low gain / no feedback).
by jymaze
03 Apr 2014, 01:27
Forum: Printed/Published Online Designs
Topic: "Personal monitoring system" design
Replies: 24
Views: 13081

Re: "Personal monitoring system" design

1M of input impedance will be fine, and yes, your should connect both L and R to the output.

DO NOT use R5 and C6, unless you want to have distortion and/or blow up your ears! It will be probably pretty loud without it already.
by jymaze
02 Apr 2014, 15:42
Forum: Printed/Published Online Designs
Topic: "Personal monitoring system" design
Replies: 24
Views: 13081

Re: "Personal monitoring system" design

Actually, if I had to use discrete transistors as a buffer after an opamp, I would use a diamond follower (resistor biased). It uses 4 transistors instead of 2, but it is a perfect design.
by jymaze
01 Apr 2014, 20:18
Forum: Printed/Published Online Designs
Topic: "Personal monitoring system" design
Replies: 24
Views: 13081

Re: "Personal monitoring system" design

Alternatively, to simplify the design a the headphone amp, you could use a LM386. It is more than enough for the purpose and sounds decent.
by jymaze
01 Apr 2014, 02:50
Forum: Printed/Published Online Designs
Topic: "Personal monitoring system" design
Replies: 24
Views: 13081

Re: "Personal monitoring system" design

Hey, It looks good,except R3 and R7 that are way too high for the purpose: I would limit both of them to 2.2Mohms (or even less actually, like 470k if you intend to never plug a passive source in B). And make R2 and R4 2.2Mohms too by the same occasion to have a nice 1M as input impedance for the gu...
by jymaze
17 Mar 2014, 12:32
Forum: Boutique Stompboxes dissected...
Topic: Amptweaker - Tight Metal [traced]
Replies: 634
Views: 284820

Re: Amptweaker - Tight Metal [traced]

So it is just mainly a difference in scooping factor in the post-eq... Predictable, but also a little disappointing. It makes me wonder if I did not make a mistake on the TM t-filter. Could that 100n be in series with the thrash switch toward the ground? It would make the thrash switch less violent,...
by jymaze
12 Feb 2014, 17:22
Forum: Boutique Stompboxes dissected...
Topic: Wampler - Triple Wreck [traced]
Replies: 420
Views: 206336

Re: Wampler -Triple Wreck- [traced]

You can try to bump R22 to 1 meg or even 2 meg. It should not create any significant noise as it is far in the chain of gain stages.
by jymaze
17 Jan 2014, 15:04
Forum: Pedal Debugging & Troubleshooting Support
Topic: Wampler Ecstasy bass control
Replies: 54
Views: 6284

Re: Wampler Ecstasy

That explains everything... I firmly believe that triple checking values is the minimum in electronics!
by jymaze
10 Dec 2013, 18:38
Forum: Switching & Wiring
Topic: Wires - Stranded vs Solid?
Replies: 6
Views: 7486

Re: wire

You can buy a box containing dozens of solid core jumpers of different pre-cut sizes for a few dollars. It saves a lot of time during wiring, instead of measuring, cutting, stripping, and tinning the stranded wire. Also solid core wire stay tends to stay where you put it and does not spring back lik...
by jymaze
09 Dec 2013, 15:19
Forum: Boutique Stompboxes dissected...
Topic: Wampler - PINNACLE II [traced]
Replies: 167
Views: 95732

Re: Wampler - PINNACLE II [traced]

The Pinnacle fed with 9v can definitely exceed 5 v p-to-p. So can most pedals really... Usually, there is an analog buffer before the digital IC (an ADC?) so this analog IC will clip first. They are protected by diodes classically, so if you exceed the input range it will clip hard. It will sound pr...
by jymaze
05 Dec 2013, 15:47
Forum: Boutique Stompboxes dissected...
Topic: Wampler - PINNACLE II [traced]
Replies: 167
Views: 95732

Re: Wampler - PINNACLE II [traced]

Pin 3 would go to the point between R8 and R18.
by jymaze
04 Dec 2013, 17:19
Forum: Boutique Stompboxes dissected...
Topic: Wampler - PINNACLE II [traced]
Replies: 167
Views: 95732

Re: Wampler - PINNACLE II [traced]

It is better to wire that half as a buffer with the input tied to the mid-point of the PSU
by jymaze
04 Dec 2013, 14:19
Forum: Modern Stompbox Effects (1975 - ...)
Topic: BBE - AM-64 American Metal [schematic]
Replies: 30
Views: 23747

Re: BBE - AM64 [schematic]

Yes, it connect to the mid-point of the power-supply, which I randomly label N for neutral.
by jymaze
02 Dec 2013, 19:26
Forum: Boutique Stompboxes dissected...
Topic: Wampler - Ecstasy [traced]
Replies: 93
Views: 59323

Re: Wampler Ecstasy [traced]

As I stated above: There is just a handful of ways of clipping a signal, but there is an infinite number of pre-EQ and post-EQ voicings. I would say if the ordering of the components is essentially the same between 2 designs (e.g.: TS, SD1, and MXR ZW Overdrive), then it can be considered a "tw...
by jymaze
02 Dec 2013, 16:15
Forum: Boutique Stompboxes dissected...
Topic: Wampler - Ecstasy [traced]
Replies: 93
Views: 59323

Re: Wampler Ecstasy [traced]

My point, they are different enough: I meant to say the Ecstasy is as close to the Timmy as the Timmy is close to the TS: They look vaguely similar from afar, but that is it. The Ecstasy has hard clipping option and the Timmy does not: It is kind of a major difference! And gain is different, biasing...
by jymaze
02 Dec 2013, 13:13
Forum: Boutique Stompboxes dissected...
Topic: Wampler - Ecstasy [traced]
Replies: 93
Views: 59323

Re: Wampler Ecstasy [traced]

The Timmy being already a variation of a Tubescreamer... But really, there are very significant variations between these designs. They may look vaguely similar from afar but it is not the case, and that is why they sound very different.
by jymaze
02 Dec 2013, 04:59
Forum: Pedal Debugging & Troubleshooting Support
Topic: Wampler Ecstasy bass control
Replies: 54
Views: 6284

Re: Wampler Ecstasy

Yes, the 1k resistor is there to limit the high cut-off to something less than infinite. In any event, there is more highs when the resistance between lugs 3 and 2 is lower, that is the point, so a log pot will be brighter at mid-point compared to a linear pot. I don't know what pot law would be bet...
by jymaze
02 Dec 2013, 01:48
Forum: Pedal Debugging & Troubleshooting Support
Topic: Wampler Ecstasy bass control
Replies: 54
Views: 6284

Re: Wampler Ecstasy

Well, it makes sense to short the 2 pins because it creates a variable series resistor that interacts with the cable at the output. So when you turn the tone pot to have more highs, you introduce more series resistance that shaves highs by interacting with the cable. It is counter-productive. I agre...