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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Error Amplifier and Trigger Generator (CB19981E)
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This transistor circuit consists of a well-known bass and treble control configuration. The...
Fast Photo Darlington (CB14647E)
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