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.

| Clique na imagem para ampliar |

Half wave control (CB21375E)
This circuit for heating elements was taken from a 1966 General Electric manual. The SCRs are...
Water Level Alarm (CB13962E)
This circuit also detects leaks and rain. I found it in a 1967 English magazine, but it can be...
MAX30004 Integrated Biopotential Detection AFE
August 2017 - This Maxim component, available from Mouser Electronics, is ideal for wearables,...