RRRRRTimed alarm for car (CB6776E)

This circuit was found in an EDN from the 90s. The circuit employs a double 555 and uses the courtesy light switches of the car as sensors.

| Clique na imagem para ampliar |

3-Tone Oscillator (CB3848E)
This traditional complementary circuit produces three different ones, adjusted in the...
Binary to Hexadecimal Converter (CB17415E)
This circuit from a 2001 publication converts binary values programmed in 4 keys into hexadecimal values...
Interface shield (CB7260E)
This circuit with TTL output was found in a 1968 EEE. The transistor can be of general use. The...