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Laser: Beams Up Down Counter Circuits

Photo: Presettable Down Counter Kit Presettable Down Counter Kit
This is a low cost 4 digit presettable down counter with output and reset. The count input can be used for both low and high speed applications.
Photo: Up/Down Counter Kit Up/Down Counter Kit
This is a low cost 4 digit Up/Down Counter. Count range is from 0000 to 9999 (counting up) or 9999 to 0000 (counting down).
Photo: Panel Meter Counter Panel Meter Counter
This is a basic low cost counter module. Two or more may be plugged together with 6-pin sockets and harness provided. Excellent use as event counter. Has a single 3-digit display. Uses the 14553 and 14551 chips. Has count and reset switches with debounce
Geiger Counter Electronic Circuit / Schematic
0 Comments - in Testing Tools
Complete instructions and circuit diagram for a Geiger counter meter device, which will allow you to measure radiation levels.
Photo: Geiger Counter Kit Radiation Alert Monitor Geiger Counter Kit Radiation Alert Monitor
Radiation Alert Monitor 4 Kit or completed unit Geiger Counter
Photo: Audio Recorder Module with 20 Seconds Memory Audio Recorder Module with 20 Seconds Memory
Recorder that can store up to 20 seconds of voice/sound