Powerful IR Emitter (CB26030E)

This modulated circuit was found in the November 1997 Electronics Now magazine. The power transistor can be any MOSFET,

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4-Digit Password Sequencial Switch (CB17440E)
This 2001 circuit uses common transistors and can be used in an electronic lock. The relay trips...
Pulse Generator 74121 (CB22434E)
This TTL circuit must be powered by a voltage of 5 V. The circuit provides pulses of 1...
TTL Counting Module (CB4672E)
This module includes an optical pass key and has two digits. We found this circuit in a 1995...