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4 VERIFICATION OF THE LOW FREQUENCY SECTION.
4.1 Initially set the input signal to 30 mV at 100Hz.
4.2 Increase the input signal slowly until the limiter starts to stabilize the output to
35V (approximately 76.7W) with an input of approx 250 mV.
4.3 Lower the input signal until the limiter is not operating. The input signal should be approx
220\230mV) and the output signal should be 32V (approx 63.5 W into the 16 ohm load).
4.4 Bypass the limiter temporarily by shorting the led section of the optocoupler, and
increase the input signal until the output signal is clipping. Verify this occurs at approx 53
volts (180 W into the 16 ohm load). The input signal should be approx 380mV.
4.5 Remove the short circuit and verify that the limiter kicks in after 7 or 8 seconds.
5 VERIFICATION OF THE HIGH FREQUENCY SECTION.
5.1 Connect the analyser and scope to the 16 ohm load on the High Freq section.
5.2 Initially set the input signal to 100 mV at 10 kHz.
5.3 Increase the input signal slowly until the limiter starts to stabilize the output to
10.1V (approx 6.4W into 16 ohms) with an input of approx 240 mV.
5.4 Lower the input signal until the limiter is not operating. The input signal should be approx
190\200mV) and the output signal should be 7.9V (approx 3.9 W into 16 ohms).
5.5 Bypass the limiter temporarily by shorting the led section of the optocoupler, and
increase the input signal until the output signal is clipping. Verify this occurs at
approx 19.2 volts (23 W into 16 ohms). The input signal should be approx 441 mV.
5.6 Remove the short circuit and verify that the limiter kicks in after 6 to 7 seconds.
6 VERIFICATION OF THE MID FREQUENCY SECTION.
6.1 Connect the analyser and scope to the 8 ohm load on the Mid Freq section.
6.2 Initially set the input signal to 120 mV at 1 kHz.
6.3 Increase the input signal slowly until the limiter starts to stabilizes the output to
14.6V (approx 26.7W into 8 ohms) with an input of approx. 560 mV.
6.4 Lower the input signal until the limiter is not operating. The input signal should be approx
490\500mV) and the output signal should be 12.9V (approx 20.9 W into 8 ohms).
6.5 Bypass the limiter temporarily by shorting the led section of the optocoupler, and
increase the input signal until the output signal is clipping. Verify this occurs at
approx 24 volts (72 W into 16 ohms). The input signal should be approx 940 mV.
6.6 Remove the short circuit and verify that the limiter kicks in after 5 to 6 seconds.
7
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