Cambridge  
  Kits
 
Antenna Noise Bridge Low Frequency Converter 60 kHz Receiver VLF Receiver 198 kHz Converter
50 & 70 MHz Converter Audio Oscillator MSF Clock Tunable Audio Notch Filter Programmable Chime
Antenna Tuner Speech Compressor Two Tone Oscillator Sound Meter 136 kHz Crystal Calibrator

SOUND METER

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MEASURE all types of sound, check that LEGAL LIMITS in factories and residential areas are met, compare lawn mowers, paper shredders etc, measure the effect of sound proofing or double glazing.
HAND HELD self contained unit has "A" weighted frequency response to compare both low and high frequency annoyance.
CALIBRATOR is built-in, linear measurement range from 40 dB (public library) to 120 dB (overhead jet take-off).
PEAK sound response, even with pulsating or irregular sounds, just set knob to dB, LED flashes when sound exceeded, or turn knob till LED flashes and read dB, no flickering needle.
DATA output shows when dB exceeded, for computer. applause timing, "Wear Ear Defenders" sign, intruder alarm, FLASH PHOTOGRAPHY, disco lights, chart recorder etc.
DESIGNED to BS 5969, internal battery or 9 V at 20 mA, 4 x 7 x 14 cm, 300 g.


This fun-to-build kit used to include all parts, tinned drilled fibre-glass pcb, microphone, case, connectors, screws etc as well as detailed assembly and operating instructions including circuit description and diagram, and was priced at 32.90 including VAT and UK postage.
Please e-mail martincambridge@live.co.uk for the latest price reduction, details of payment and any extra parts now neeeded.