Put this together and you get...?

strungout · February 07, 2005, 09:18:17 AM

Oy.

First of all: :oops:

So, I came to realize that this probably isn't a boss extortion.

LM3900 = quad op-amp
4015 = dual 4-stage static shift register
4011 = quad 2 input NAND gate
4069 = HEX inverter
4081 = quad 2 input AND gate

Does that ring a bell as to what this pedal might be? I'd like to know so I could hunt for the schematic and repair it.

Any info appreciated.

Paul Perry (Frostwave) · February 07, 2005, 05:56:36 PM

Can you send a pic of the board? someone might recognise the 'style'..

strungout · February 08, 2005, 08:42:23 AM

Smart idea.

Paul Perry (Frostwave) · February 08, 2005, 08:48:39 AM

Are you sure it is out of a FX box?? it looks more like
some kind of industrial controller to me!
The solder side is pretty interesting, freestyle :wink:

GreenEye · February 08, 2005, 08:52:59 AM

It's a bomb! RUN

strungout · February 08, 2005, 09:03:13 AM

Lol, at this point, I guess I can't even be sure its an FX : P

Seriously, I remember a friend bringing it in a red box with a "punch" knob, which is why I thought it was an xtortion. But looking at the XT-2 schemo, I don't see where these NAND and AND gates and whatnots would fit in...

Anyway just hoping I'll get lucky and someone will tell me what it is.

puretube · February 08, 2005, 09:42:07 AM

some drum-trigger, or triggered drumsound box? (crashpadlike?)

Johan · February 08, 2005, 10:41:14 AM

how about some kind of stagetruner?...looks japanese to me...korg or suzuki, perhaps?...

Johan

Peter Snowberg · February 08, 2005, 11:42:13 AM

It looks like a Japanese process control of some sort to me too. The Norton opamp points this way even more.

Tachometer signal conditioning?

The layout style has the advantage of fast processing times with low etchant useage.

Hmmm..... dual 4 stage shift register.... I wonder if it's a digital filter. OK, who wants to redraw the schematic using logic symbols?

RDV · February 08, 2005, 12:22:23 PM

When you google H380 you get a lot of pomputer monitor stuff.

RDV

Paul Perry (Frostwave) · February 08, 2005, 06:34:15 PM

And here's what you get if you search for GCMK-19EHB:

http://www.vintage-technology.info/Pages/calculators/casiom1.htm

that would explain the shift register :lol:

Dan N · February 08, 2005, 08:27:27 PM

Quote from: Paul Perry (Frostwave)And here's what you get if you search for GCMK-19EHB:

http://www.vintage-technology.info/Pages/calculators/casiom1.htm

that would explain the shift register :lol:

That exact same number is on the pcb of an old Casio MT-65 keyboard.

strungout · February 12, 2005, 07:00:22 PM

So...I can put out beats AND help you do your taxes.

I'll try doing a redraw with logic symbols. Shouldn't be much harder than relating the symbol to the pin number...might get a bit criss-crossy...

Thnx for try out some guesses

JimRayden · February 12, 2005, 07:13:44 PM

Are you sure it's repairable? I mean it's on a PCB and it looks like it's broken off from somewhere...

-----------
Jimbo

strungout · February 14, 2005, 10:07:22 AM

Ok, I hope marking the pin number didn't make it more confusing than anything else.

Here's a schemo for the logic part:

http://www.freewebs.com/fkstilt/unknown-lgc.htm

Ciao.

j0shua · February 14, 2005, 10:27:29 AM

is very close to 1 PCB i saw some time ago ( 2 years ) on IMAC Monitor

News:

Put this together and you get...?