Search found 36 matches
- 15 Jul 2022, 00:08
- Forum: Davidoff Library
- Topic: Audio Phaser, Electronics Today International, September 1976
- Replies: 27
- Views: 3763
Re: Audio Phaser, Electronics Today International, September 1976
Maybe it's intended to keep the signal level low and minimize distortion, when using the mosfets as VCR.
- 08 Feb 2022, 12:30
- Forum: Davidoff Library
- Topic: 60W EL34 tube amp, in: Quattrocose, February 1967 🇮🇹
- Replies: 4
- Views: 1155
Re: 60W EL34 tube amp, in: Quattrocose, February 1967 🇮🇹
The Marshall 200W tone control is inside the feedback loop.
https://el34world.com/charts/Schematics ... d_200w.pdf
It always seemed strange to me...
https://el34world.com/charts/Schematics ... d_200w.pdf
It always seemed strange to me...
- 28 Oct 2021, 12:30
- Forum: Modern Stompbox Effects (1975 - ...)
- Topic: BOSS - OD-2r into OD-2 conversion
- Replies: 3
- Views: 2345
Re: BOSS - OD-2r into OD-2 conversion
The discrete opamps in the OD-2 have a lower power supply (5.6V versus 8V on the OD-2r). This pedal is a candidate for an integrated opamp version, like the dylan159's "blue pilot".
- 13 Dec 2012, 13:20
- Forum: Pimp-My-Cheap-Pedal
- Topic: BYOC Comp Threshold Control + Vbias question
- Replies: 5
- Views: 3394
Re: BYOC Comp Threshold Control + Vbias question
Well, the Emma is a Dynacomp with mods. https://www.freestompboxes.org/viewtopic.php?f=7&t=4340&hilit=emma And the Dynacomp is actually a limiter, not a compressor. The pot changes threshold. There's a plot of the limiting curve of a Dynacomp with the pot on max and min on the trhead about m...
- 12 Dec 2012, 11:20
- Forum: Pimp-My-Cheap-Pedal
- Topic: BYOC Comp Threshold Control + Vbias question
- Replies: 5
- Views: 3394
Re: BYOC Comp Threshold Control + Vbias question
Well, the "sustain" pot is already a threshold control. (and btw the "attack" pot is actually a release control - see the emma transmogrifier for proper attack/release controls) You may want to investigate how to add a "ratio" control to this circuit, this is a mod I've...
- 30 Oct 2012, 16:29
- Forum: DIY Projects
- Topic: THE ENGINEER'S THUMB... At last, a better compressor! [documentation]
- Replies: 101
- Views: 150578
Re: THE ENGINEER'S THUMB... At last, a better compresso [documentation]
Thanks, that's close to how I imagined it.
- 30 Oct 2012, 00:04
- Forum: DIY Projects
- Topic: THE ENGINEER'S THUMB... At last, a better compressor! [documentation]
- Replies: 101
- Views: 150578
Re: THE ENGINEER'S THUMB... At last, a better compresso [documentation]
Please forgive if I insist on the matter, I'm not looking for "deffects" on your design or something like that, I just want to understand the circuit and know the best ways to use it. Looking at the blue curve, if I set the threshold for 100mV for example, to plot the new curve I Imagine I...
- 29 Oct 2012, 18:58
- Forum: DIY Projects
- Topic: THE ENGINEER'S THUMB... At last, a better compressor! [documentation]
- Replies: 101
- Views: 150578
Re: THE ENGINEER'S THUMB... At last, a better compresso [documentation]
Merlin, The blue line in your graph shows what happens with a high ratio (limiting), low threshold. So it works like a sustainer, like we are used to with guitar "compressors". If I wanted to use it with as a limiter, with the high ratio, but with a high threshold, so that I was just tamin...
- 27 Oct 2012, 14:51
- Forum: DIY Projects
- Topic: THE ENGINEER'S THUMB... At last, a better compressor! [documentation]
- Replies: 101
- Views: 150578
Re: THE ENGINEER'S THUMB... At last, a better compresso [documentation]
I guess they feel interactive because the ratio control changes how much gain for signals below the trheshold. If you have a compression curve like this: http://www.radialeng.com/whbeta/images/komit-dev-flexknee-1.jpg A non-interative ratio control would be able change the slope of the curve after t...
- 27 Apr 2012, 21:44
- Forum: Modern Stompbox Effects (1975 - ...)
- Topic: AMT Electronics - S1 Legend series [schematic]
- Replies: 633
- Views: 309803
Re: AMT S1 Legend series [gut shots] [schematic]
can you post the voltages at each node?
- 27 Apr 2012, 16:28
- Forum: DIY Projects
- Topic: THE ENGINEER'S THUMB... At last, a better compressor! [documentation]
- Replies: 101
- Views: 150578
Re: THE ENGINEER'S THUMB... At last, a better compresso [documentation]
Thats for the article! :D Here some more joyful reading on this fascinating subject (at least for a nerd like me): "Audio Dynamic Range Compression for Minimum Perceived Distortion" Barry A. Blesser IEEE Transactions on Audio and Electroacoustics, vol. AU-17, No. 1, March 1969 "On Tr...
- 27 Apr 2012, 16:23
- Forum: Modern Stompbox Effects (1975 - ...)
- Topic: AMT Electronics - S1 Legend series [schematic]
- Replies: 633
- Views: 309803
Re: AMT S1 Legend series [gut shots] [schematic]
The cab simulation is driving me nuts! Looks like all the Legend series have the same cab sim circuit.. :scratch: I have bread boarded it about 3 or 4 different times trying all sorts of crazy crap but still get nothing? I think the schematic is missing something...? Can anybody flex their brain mu...
- 26 Apr 2012, 16:10
- Forum: DIY Projects
- Topic: THE ENGINEER'S THUMB... At last, a better compressor! [documentation]
- Replies: 101
- Views: 150578
Re: THE ENGINEER'S THUMB... At last, a better compresso [documentation]
A lot of people complain about digital fx, recording interfaces or guitar synths that have latencies around 8-10 ms, or even less. Studio gear, if you're not doing "software monitoring", can have a much longer latency with no problem. For a guitar compressor, no latency is way more importa...
- 26 Apr 2012, 15:48
- Forum: Amplifiers
- Topic: Solid state Amp discussion allowed (of course!)
- Replies: 39
- Views: 70059
Re: Solid state Amp discussion allowed (of course!)
Check this:rocklander wrote:is that seriously a 2 component amplifier? just seems too simple
http://www.ssguitar.com/index.php?topic=1630.0
10W x2 (stereo!).
- 26 Apr 2012, 12:09
- Forum: DIY Projects
- Topic: THE ENGINEER'S THUMB... At last, a better compressor! [documentation]
- Replies: 101
- Views: 150578
Re: THE ENGINEER'S THUMB... At last, a better compresso [documentation]
If I had to guess how ANY compressor with a fast attack and a relatively slow release would behave with a signal that has a short, large transient, a fast decay and then a much lower sustain level, such as aguitar note, I'd bet it would completely lack overshoot, like above, BUT it would have kind o...
- 25 Apr 2012, 12:33
- Forum: DIY Projects
- Topic: THE ENGINEER'S THUMB... At last, a better compressor! [documentation]
- Replies: 101
- Views: 150578
Re: THE ENGINEER'S THUMB... At last, a better compresso [documentation]
Almost a nice idea, but unfortunately there's rather a lot of "prior art": Hey, that's mine :) It's from 1990. There's an error on the drawing, swap inputs +/- on U9A. I only tested it on bass, I liked it. BTW later I learned there was a (supposedly very nice) MXR studio limiter that used...
- 20 Apr 2012, 23:12
- Forum: Modern Stompbox Effects (1975 - ...)
- Topic: AMT Electronics - S1 Legend series [schematic]
- Replies: 633
- Views: 309803
Re: AMT S1 Legend series [gut shots] [schematic]
I've simulated it (only the speaker simulation, not the whole pedal) in LTspice. Seems OK, but a bit dark. It may be difficult to bias, the only fet model I have that worked was a J201 (specially for the second fet, the common source at the stage which has the CRC "T" in the feedback - the...
- 06 Apr 2012, 17:07
- Forum: Modern Stompbox Effects (1975 - ...)
- Topic: Vox - Cooltron Line of pedals
- Replies: 22
- Views: 18395
Re: Vox - Cooltron CT-01DS, CT-02OD and CT-03BT
Sorry to bump such an ancient thread. But I think we were looking at the wrong patent: http://www.google.com.br/patents/US7397303?printsec=abstract&dq=korg+tube&ei=khl_T7CQGYnDgAef3MSHCA#v=onepage&q=korg%20tube&f=false This one matches with the actual schematics. Look at fig. 2, very...
- 08 Mar 2010, 21:20
- Forum: Modern Stompbox Effects (1975 - ...)
- Topic: Giannini - FZ-110 Axcess Fuzz
- Replies: 16
- Views: 6578
Re: GIANNINI New AXCESS FUZZ FZ-110
At R$ 120 it may be cheaper than to import the switch and a hammond box...
- 11 Dec 2008, 10:53
- Forum: Boutique Stompboxes dissected...
- Topic: Ayan - Smooth & Slim [traced]
- Replies: 74
- Views: 20574
Re: Ayan - Smooth & Slim [traced]
Some background. Gil Ayan used to post in Ampage and in the Boogie Talk mail list. I think a couple of the Mesa Boogie schematics that are on the net were contributed by him. From what I remember, the S&S was not a proper "business", it was more like someone at the boogie list would e-...