The examples includes cabletester / fusetester / batterytester - PP type CT01, PC ISA card preamplifier and power supply for loudspeaker measurement microphone - PP type MI02, white noise and pink noise generator for loudspeaker power testing according to AES specification - PP type NG01, PC sound card based stepped sinewave generator for initial frequency response adjustment on video recorders.
Cable-, fuse-, and battery-tester, PP type CT01A handy cable tester for test of cables with XLR and ¼" jack connectors. The tester has 4 keys and 8 high-intensity LEDs to provide a clear and unambiguous indication of the cable connections.
I have designed the circuits, the PCB, the mechanics and test procedure and manufactured and tested 50 cable testers.
PP CT01 datasheet
Measurement microphone amplifier, PP type MI02A half-length PC ISA expansion card that contains a galvanically isolated power supply and a microphone amplifier. With this card and a signal processing card mounted in a PC, a complete, portable loudspeaker measurement system can be realized. The microphone amplifier can be powered from the PC or from an external 5 V power supply.
Some key features are:
- Balanced, low noise microphone amplifier.
- -20 dB to 40 dB gain in 10 dB steps.
- 91 dB to 124 dB dynamic range.
- 28 V supply voltage output.
- 48 V phantom supply output.
- 120 V microphone pre-amplifier supply voltage output.
- 200 V microphone polarization voltage output.
PP MI02 datasheet
Noise generator for loudspeaker power testing, PP type NG0119" 1-unit noise generator that deliver white or pink noise with crest-factors of 3 dB, 6 dB or 9 dB.
The noise source in this generator is an ultra-low-noise op-amp, as this component has a very linear noise spectrum in the 20 Hz - 20 KHz frequency range and a very well defined and stable noise level.
I have designed the circuits, the PCB, the mechanics and test procedure and manufactured and tested 3 noise generators.