onboard organ

[cakeworks]

Hey, I know it's not quite diy effects but anyway, I'm looking at buying a crap guitar and putting one of those organ kits from dse or jaycar in using regular momentary switches for keys and a seperate line out for it, problem is all the kits and schems i've found have an 8ohm speaker for an output.

So the question is this; Is there a way of converting the 8ohm impedance to a normal line out without a bulky transformer OR is there a schem out there for a simple diy organ thingo with a lineout... thanks for any light anyone can shed on the subject

[Harry]

Organ kit?

[choklitlove]

a lot of kits will work fine just replacing the speaker with a jack.  i would just add a volume pot of some sort inbetween the circuit and the jack.

[cakeworks]

thanks for the heads up

Organ kit?

yeah, i'm wanting to get started on the apendix model soon, already done some kidneys... wanna get my experience up before i attempt any vital organs.

[tcobretti]

My understanding is that running an amplifier directly into another amplifier can destroy amp #2, so I would proceed with caution.  I might at the very least try it with a cheapo amp before I plugged it onto my Dumble (BTW, I don't actually own a Dumble).

[Meanderthal]

 I think he's talking about the ... err... 'amp' in a 555 chip, which would make it the equivalent of the 1/4 in jack out on an APC which shows an 8 ohm speaker on the Forrest Mims schematic. I have also soldered 1/4 in jack outs into Casio keyboards directly from the speaker out and it works just fine. We're talking maybe a half watt output. Wouldn't be much different than any of those 386 based distortions. I really don't think there's much to worry about here in this case.

[petemoore]

  Try a voltage divider before or maybe just a small value pot to tame the output?

[Meanderthal]

 I agree- a volume pot would be quite helpful especially for matching output level to something close to the guitar's. I forgot to mention that although those Casios work just fine (and the APC) they are pretty loud compared to a guitar... of course, those already have a volume control, but some of the simple 'organ' schematics I've seen don't seem to have any at all.
BTW, I would recommend one tuned with resistance(trimpots), the Forest Mims one (or anything similar)with multiple caps will be impossible to fine tune.

[Rodgre]

Now, if you were really ambitious, you'd roll your own Guitorgan!



http://www.guitorganrepair.com/default.html
Roger

[tcobretti]

Yeah, the guitorgan was the first thing I thought of when I saw the thread's title.

I have wanted a guitorgan for years, but something tells me it wouldn't live up to my expectations.