Instruction manual

STC1• 21
SETUP AND TESTING:
You can test your STC1 by simply hooking it up and trying it or by using test
equipment.
For a test with testing equipment you will need:
❍ Audio Signal Generator
❍ DMM or oscilloscope
❍ 9 to 15 volt DC power supply.
All we want to do here is verify that our assembly has been done correctly, and
calibrate the unit for proper operation. Before we begin, make sure that all
controls are set in the center position, all capacitors are mounted in the correct
direction, and the board has been checked at least twice for any errors.
❒ 1. Check Pin 4 of U1 for +10 volts DC.
❒ 2. Check Pin 10 of U1 for +5 volts DC.
❒ 3. Connect your oscilloscope probe to pin 9 of U6. Verify that there is a
good clean square wave at 1.5MHz. This means the switched capacitor
filters should be operating, as well as the oscillator and dividers.
❒ 4. Connect the signal generator to the left channel input, J1. Set it at 1kHz.
❒ 5. Using the DMM or oscilloscope, set the input voltage to about 1 volt
peak.
❒ 6. Adjust R23 until the left clip LED barely lights.
❒ 7. Check the output voltage of the left channel at J2, it should be
between .5 and 1 volts peak.
❒ 8. Perform the same for the right channel, using R49 to adjust the LED.
❒ 9. Any troubles? Check out the troubleshooting guide for help in finding a
problem.