Subsonic Filter (CB25143E)

We found this circuit in the June 1988 Radio Electronics magazine. The power supply must be symmetrical.

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Educational Counter (CB24770E)
This counter was found in the November 19983 issue of Radio Electronics magazine. The power supply...
TTL Optical Sensor Shield (CB6031E)
This circuit allows coupling optical signals to a TTL input with excellent performance. Among the...
Sensitive Photo Relay CB13492E (CB13492E)
This circuit is from the documentation of Radio Shack 1975. It can be mounted with 12 V relays,...