microBrute Modulator
May 2010, Rev 1
− 11 −
© 2010 Eastern Voltage Research, LLC
microBrute Modulator Instruction Manual
Congratulations! You have just completed your microBrute Modulator kit. Please take a
few moments to look over the board and ensure that all the components are installed
properly with the correct orientation. Since some of the parts may be unfamiliar to you,
you may want to be extra sure that they have been inserted correctly. After you are sure
that everything seems to be properly installed, move on to the set-up and testing section.
Set-up and Testing
Okay, so lets begin!
RECOMMENDED TEST EQUIPMENT, NOT SUPPLIED
1
Analog or Digital Multimeter
1
Oscilloscope (not required, but can be useful if you wish to verify timing)
1. Connect the 9V battery to the battery connector and turn the power switch ON.
Using a multimeter, verify the voltages below:
Check
Component
Measuring Point
Voltage
U1
Pin 8 (Vcc)
9V
±
0.5V
U1
Pin 4 (Reset)
9V
±
0.5V
U2
Pin 8 (Vcc)
9V
±
0.5V
Note: All voltages should be measured with respect to the GND screw terminal.
2. Verify that LED, D1, is illuminated. If it is not, and the voltages above are
correct, the LED may be installed backwards.
3. If you have an oscilloscope, connect channel 1 scope probe to the output of the
microBrute Modulator at J1. Verify that the pulsewidth adjustment of the
modulator is approximately from 0 to 180us. Pulsewidth should NOT exceed
200us.
4. If you have an oscilloscope, connect channel 1 scope probe to the output of the
microBrute Modulator at J1. Verify that the pulse repetition frequency (PRF)
adjustment of the modulator is approximately 50Hz to 150Hz.
Congratulations! Your microBrute Modulator is now completed and operational.
