Keyboard Hexadecimal Encoder (CB13763E)

We found this CMOS circuit in a 1978 publication. It allows you to use a standard calculator keyboard with 16 keys for encoding in hexadecimal.

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Wien Bridge Oscillator (CB4922E)
This circuit uses an operational that is not currently common. We found it in an old American...
Phase Shift Oscillator (CB24454E)
This circuit uses two transistors to obtain low frequency sinusoidal signals. We found it in a...
Micro Integrated Amplifier (CB5039E)
This amplifier can be powered with voltages between 2 and 5 V with power up to 100 mW. The minimum...