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Old 11-27-2009, 02:53 PM
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John John is offline
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Default Driving Relays with MPA outputs

Here's a diagram showing how a relay might be controlled by an MPA logic output. This assumes that the relay coil operates on 9VDC.
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Old 09-11-2010, 01:47 AM
EdwardFist EdwardFist is offline
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Default Noise Machine Control

I`m interested in using the MPA to control a circuit bent chorus pedal noise machine. I`m planning to use DPST reed relays to control the switching with an LED to indicate when the bend is activated.

Can you let me know what other values might work for the diode and transistor as I`m having trouble tracking down these exact values?

Thanks

EF

Last edited by EdwardFist; 09-11-2010 at 01:58 AM.
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Old 09-11-2010, 03:36 PM
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Quote:
Originally Posted by EdwardFist View Post
I`m interested in using the MPA to control a circuit bent chorus pedal noise machine. I`m planning to use DPST reed relays to control the switching with an LED to indicate when the bend is activated.

Can you let me know what other values might work for the diode and transistor as I`m having trouble tracking down these exact values?
Lots of substitutions will work fine. The exact requirements depend on the specification of the your relays. What is the voltage and current requirement of the relay coil?

You can probably use almost any non-zener diode instead of the 1N4004. But I like to use a more robust "silicon rectifier" diode instead of a "small signal" diode.

Also, instead of the TIP122, a large variety of NPN Darlington transistors can be substituted.
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