How do generate a signal (rising or falling edge) to switch

[xcpointx]

I have no idea what kind of signal to give this unit to get it to
switch. Im sure it will be an easy answer for any electronics
professional out there.

Its a guitar preamp (carvin Quad X), with old style 'midi' input jack
plugs

Here is the relevant part of the schematics:
http://www.crossingpoint.za.net/quadx/octopus/octo1.gif

and

http://www.crossingpoint.za.net/quadx/octopus/octo2.gif

the whole schematic is
http://www.crossingpoint.za.net/quadx/pre%20midi%20schematics/8400114_C_G_small.gif


Your help will really be appreciated.

Any advice?

 

[martin griffith]

On 19 May 2004 08:23:03 -0700, googler@punk.co.za (xcpointx) wrote:

I have no idea what kind of signal to give this unit to get it to
switch. Im sure it will be an easy answer for any electronics
professional out there.

Its a guitar preamp (carvin Quad X), with old style 'midi' input jack
plugs

Here is the relevant part of the schematics:
http://www.crossingpoint.za.net/quadx/octopus/octo1.gif

and

http://www.crossingpoint.za.net/quadx/octopus/octo2.gif

the whole schematic is
http://www.crossingpoint.za.net/quadx/pre%20midi%20schematics/8400114_C_G_small.gif


Your help will really be appreciated.

Any advice?
It looks as if you just short the connector pin to ground, or chassis

to produce the pulse



martin

Three things are certain:
Death, taxes and lost data.
Guess which has occurred.

 

[xcpointx]

That DOES work for this part
http://www.crossingpoint.za.net/quadx/octopus/octo2.gif
(they have a schmitt trigger)
It needs to turn ON/OFF. Shorting only turns that input ON, repeating
the action, or even latching it for awhile then going off ground, has
no affect except turning it on.

Grouding has no affect for this part of the circuit:
http://www.crossingpoint.za.net/quadx/octopus/octo1.gif
(which has no schmitt trigger?)
This one only needs to turn ON

The other difference between the 2 is that one input stipulates
leading edge, the other trailing edge on the schematic?

Does it not need some kind of voltage change? The actual inputs on
this audio unit are 1/4inch jacks.

martin griffith <martingriffith@yahoo.co.uk> wrote in message news:

It looks as if you just short the connector pin to ground, or chassis
to produce the pulse



martin