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Thanks for all your help folks.

Zig

Thanks Dave ... appreciate that I can use a standard stereo jack for this but was wanting to understand how the switched jacks work as I gues the advantage of those is that if for some reason you had to use a stereo jack cable in an emergency you would still have a working circuit.

OK ... at the risk of sounding dim ... you lost me.

From what I am picking up, the 6-legged switched stereo jacks have tip(normal), ring(normal) and sleeve(normal) legs plus corresponding tip(switch), ring(switch) and sleeve(switch) legs?

If I am correct so far, then for my 9-volt battery on/off switch what do I do? Do I simply connect the negative terminal of the battery to the sleeve(switch) leg - which is connected to the sleeve(normal) when a jack (of any type) is inserted and disconnected when the jack is removed?

Thanx

Hi Folks,

Thanks for all your help so far.

No I am not planning to run 9-volts up the guitar cable, there will be a 9-volt battery in the guitar and a single output jack - that can be stereo - if I use the ring-sleeve switch option. What I was trying to get across was that whereas on a pedal the R/S switch is on the input jack ... for my guitar, the R/S switch would be on the output jack as there is no input jack as the pickups are the input ... gut guessing that doesn't matter?

Can someone tell me how the switched jacks work as the ones I have seen seem to have 6 legs on them ... so what is happening here, what are all those legs for? Guessing 3 of them are T/S/R ... but what about the other 3?

Thanx

Zig

Hi folks,

Building a small pre-amp circulit to sit between the tone/volume control circuit and the (female) 1/4" output jack connector on an acoustic guitar.

Just now getting to the part were I wan't to make sure that the pre-amp circuit is only powered by its 9-volt battery when a (male) 1/4" jack is inserted.

I have heard that this can be done by ensuring that the female output jack (on the guitar body) is stereo and that the input jack is mono, and then running the negative off the 9-volt battery to the ring connector (on the stereo input) which is then shorted to the sleeve connector (on the stereo input) when a mono jack is inserted? But not sure if I have got all of that right as I cannot find any clear instructions :-S

But then I have heard others saying that this approach is a hack and not recommended ... and I do wonder what would happen if you inserted a stereo jack ... hmmmm?

And then I heard that there were "switched jacks" out there that had this power-on-off functionality built-in, but cannot find any clear information on them either that shows the connections, how they work, etc.

So that is why I am coming to you guys ... help!

Can someone explain all this to me ... or point me to a site that does?

Thanx

Ziggy

Folks,

Thanks for all your posts, you have all been a big help.

I am going to press on with the pork barrell ... may take me some time as I need to get a few more parts and other odds and ends ... but going to give it a go!

Will let you know how I get on ...

Thanx

ziggy

Hmmm ... over 40 resistors ... nearly 25 caps .. and a few other odds & ends ... that is not a "low parts count" in my books ... I am thinking I may have bit off more than I can chew :-(

Understand I could replace the "rate" knob with a trim pot ... but wondering how much of that circuit I actually need for just a "depth" function ... with that many parts can't see my fitting it into a small enclosure either :-(

Hey folks,

I am brand new to building pedals, brand new to this forum ... but do have a little electronics background.

Was just searching around the net as I wanted to build a real small chorus pedal. I have a relatively cheap chorus pedal at the moment and only use the "depth" side of it which gives a fuller sound to my Ovation ... so was wanting to build a simpler and much smaller unit really with just a single control depth function running off a 9-volt battery.

Whilst searching, I saw lots of posts about Boss Chorus pedals to the effect "get the MN3007 chip, its the best and you won't be able to get them soon as they are discontinued and there are lots of fakes around ... yada yada yada"  ... so without much further research (i.e. just a cursory check that the Boss pedals have a depth function) ... and my usual impulsive behaviour ... I just (panic) bought the MN3007 & MN3101 pair from Doctor Tweek ... then thought "hmmm ... can I actually build what I want with this"?

I then found one circuit with that chip and it looked very complex ... but I think it was using all of the features of the chip with a bit more added on!

Was hoping even to build it first maybe on a breadboard, test it was all ok and then commit it to a PCB and enclosure.

I have the panasonic datasheet that has a sample application with about 4 op-amps to produce what they call an "echo effect generation circuit" ... but not sure whether that is really what I am after.

Can anyone give me any pointers? Can I build a fairly simple "depth" chorus effect with the MN3007? Are there any simple circuits out there explaining how to do this?

Any help appreciated

Thanx

Ziggy