[sdiy] impedence stuff???

[harry]

This would be my first try...

ultrahype wrote:

> HI is there a simple way to calculate what needs to be done in the
> following scenerios: line level to gtr pedal
>
> I'd use maybe a 10K resistor to ground on the line output... as a
> load to make sure the line output is satisfied (maybe not
> necessary)...
> then a 10:1 voltage divider... maybe a 100K and a 10K... you might
> need
> to play around a little.
>
> Another take might be a 10K and 1K voltage divider... with a 100K
> resistor
> in series to simulat the rather high impedance of most guitars...
>
> Or just the divider...
>
>  gtr pedal to line level
> Opamp gain of 10 or so...
>  speaker level to line level
>
> Danger Will Robinson... I would only do this using a transformer...
> Put a resistive load of suitable wattage on the amp... then a
> voltage divider and a small transformer... them run the other end
> of the transformer to the line input. You might need resistors on
> that end as well.... Connecting directly can blow an amp or mixer
> easily. You may want to buy a commercial unit here... that transformer
>
> is probably not gonna come cheap anyway...
>  line level to instrument ( amp ) input
> Same as line to guitar input
>
> Feel free to inquire on/off list if this wasn't clear.
>
> H^) harry
>
>
>
>
>   i have a bunch of pedals i want to use with my console and my
> results have not been to hot yet also i want to add line outs yo a
> bunch of ( ciruit bent) stuff i have and i just think that you are the
> guys to ask because i would like technical info on this . my
> electronic knowledge is limited , as of now , but im working on it,
> thanks for any help links or recomended reading. Jim Heinz