so how does it actually work? On the echoczar this "slide" is using the effect that the PLL is locking onto the voltage going into pin 9 and adjusting its clock frequency, why does it work here? I beleive, It works due to C20 providing kinda smooth transition (charge/discharge) between VCO clock ad...

Who is everyone using for veroboard nowadays? I had been using Veroboard.com, who were awesome, but despite their URL it seems they no longer sell the stuff. I just ordered some stuff from Rapid Online which is okay, but the quality isnt really there. Holes tend to tear out when you cut traces and i...

Very cool! Ages ago I implemented something like a ramp control on a Leslie type effect, and I think this is similar. I'm not fully sure what that was, though. I have some notes that kinda look like a GEOFEX LERA but its a different circuit....not sure what it could be from.

FWIW that's not how the filter switch on an OR120 works Agree - but it achieves the same result. In theory but the values you have here are also pretty far off from an Orange to have equivalent capacitance. On an Orange the equivalent at the six settings is roughly 68nF, 4.4nF, 2.3nF, 1.1nF, 500pF,...

FWIW that's not how the filter switch on an OR120 works. The caps are actually in series. Not that the schematic isnt completely valid as its own thing, just making a note for clarity.

Dont have any schematics, per se, but I can chime in with some info. Awhile back a friend sent me two MPC modules in hopes that could get them working. The problem being that I dont have an MPC guitar to test them on. So I built a little pedal that could accept MPC cartridges for testing and use. Bo...

Looks pretty cool, but a question (maybe a dumb one?). Why even fuss with the DC/DC converter? Couldnt you just use an AC input like an amp and have a power transformer and rectifier?

Sure: https://live.staticflickr.com/4418/36009416050_74c374404e_z.jpg https://live.staticflickr.com/4411/36009408550_feae068cd0_z.jpg https://live.staticflickr.com/4363/36009408520_54bb8b11a8_z.jpg https://live.staticflickr.com/4439/36009415170_701892b89f_z.jpg Also, much more recently I made these ...

If you take to him he might sell you an enclosure, provided he has some.

FWIW.....it sounds like you want to build a small amp anyway, so this may be moot, but in general dont let anyone tell you that you cant build a full sized amp as your first build. A 50W Marshall was my first amp build. They arent complex amps at all and the voltages on a Champ are just as nasty.

Dunno what it was used in originally, but the current user has it for guitar. The documentation for it said it could be used for a variety of uses including recording, hifi, guitar, etc. Some quick research tells me that this company was around in the early 80s, and for a bit used by Randy Rhodes an...

Had one of these obscure little buggers come across my bench recently so I thought id trace it. Its not exactly remarkable but does sound good. The original switching is garbage which is why ive highlighted to remove it. https://c1.staticflickr.com/1/775/23343786262_a86e26e096_c.jpg https://c2.stati...

Nocentelli wrote:That looks pretty simple for a Leslie type effect: Handful of transistors, caps and resistors. I wonder if it's some sort of phase shift oscillator like the magnavibe.

But also I dont an optocoupler in there, which a Magnavibe would have....

Rad! Do you plan on tracing out a schematic? It'd be pretty easy if you have unit in hand. Probably wouldnt be so hard to do from the pics, either, but some part values and transistor types would be missing.

Books are unnecessary at this point because you can get the knowledge you need from the internet. What you're describing will work, yes, but its not exactly a sure-fire way. Better to do two things: 1. Build yourself a capacitor discharge tool. It can be as simple as an alligator clip and a stick, o...

Thanks man!

Quick question....got a guy in Melbourne that has one of my builds and it needs a replacement 3PDT. Where's the best place (internet store, id assume) to get a 3PDT either in Australia or with easy/cheap shipping to Australia??

Ok so I've opened up the amp and got the old transformer out and the new transformer mounted, according to the schematic from sinner's response, I'm only using the 0v common tap and the 245v tap on the primary side and the neutral leg from ac power in is fused. On the ac15hw1 there's an additional ...

Depending on the specific version there may be specific needs, but in general there are a lot of transformers out there that will fit the bill for this. Anything spec'd for an 18W Marshall would be a good place to start, like so: http://www.classictone.net/Marshall-18W-Style-Transformers.html. But a...

Frank_NH wrote:Be sure to get the epoxy fiber stripboard and not phenolic (phenolic is OK but is lighter duty than the epoxy fiber material).

I'd argue for the opposite. The phenolic stuff you can score and snap with a razor. The epoxy stuff you need to cut with a saw.