8 lug 2014
Hoping to pleasemany people, I show below the formal logic of a 3PDT switch wich is the square based, three row, three-column switch common to pedals and stompbox (valid also for handy switch).
You can find more detailed instructions about building a "looper stompbox" easily typing it in the google box.
The looper use a 3PDT switch to address the signal through the Send/Receive FX loop or to bypass it.
Make sure you're watching your switch with the slats horizontal. The 3PDT is similar to the DPDT allowing to use a LED light to show when the send/return loop is "on" or "off". The first picture below shows the OFF position where the LED is off and the signal goes directly to the output.
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| OFF POSITION |
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| ON POSITION |
Note: The three columns of the 3DPT are inter-changeable one each other, respecting the relatives connections. The impedance of the resistor is due to applied VDC (usually 9V on stompboxes) and used LED data sheet values.
