CMOS Siren (CB26157E)

Found in the 1991 Electronics Experimenter Handbook magazine, this circuit has good power and is recommended to be triggered by light.

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General Purpose Preamplifier (CB4772E)
Circuits similar to this appear elsewhere in this section. The transistors can be BC549 (low...
Acid rain monitor (CB7992E)
This circuit indicates when a rain is acidic by monitoring its pH. The circuit is from a 90s RE...
Triggered Clock (CB16014E)
In a microprocessor project (shield) for control applications, a triggered clock can be useful....