Could DIY Pedals Damage Keyboard Input?

[samp]

Hi,

Just wondering if there is any potential damage a DIY fx pedal circuit (mostly CMOS chips) could have on an old 80's Casio keyboard?

I run the keyboard headphone out into the pedals and don't want the current to somehow run backward. Can anyone suggest a type of 'backfire guard' (diodes?)to protect my beloved Casiotone 401, or am I being overly cautious?

Thanks

[State Machine]

If your concerned about doing anything to your headphone out from your keyboard, just use a cheap buffer like this:

http://www.head-fi.org/products/pyle-pro-pha40-4-channel-stereo-headphone-amplifier

If you blow one amp output, you will have three to go ... hahaha.

Diodes, no, what if you connect to a negative voltage? Diodes wont do anything. I believe if your careful and use buffers in your pedal designs, you would normally be fine.

With electronics, you can never be overly cautious, especially with gear you love.

Kindly,
Bill

[samp]

Thanks for your help Bill,

the headphone amp is a good idea. I will look further into buffers.

Thanks

[State Machine]

My pleasure