Cover by David Erik Nelson

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Building It

  1. Look at the schematic in Figure 15-3. We’re going to start by building the optoisolator (located at the bottom of the schematic in the little dashed rectangle). In the old Fender amps, this unit was called a vibrato bug.

    Solder a 470 ohm resistor (yellow-purple-brown) to the base of one leg of the photoresistor. Then, place the photoresistor and one LED snout-to-snout. Cock out the negative leg of the LED (that is the one marked by the flattened side of the LED lens; see Figure 15-4) so that you’ll recognize it later. Now wrap these two together with a strip of duct tape, sealing out as much light as possible.

    Circuit diagram for the Blinkie Tremolo

    Figure 15-3. Circuit diagram ...

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