Voltage reference (CB20820E)

This circuit was found in documentation from the 1980s. The circuit can be designed based on modern components.

Siren with the LM3909 (CB14289E)
The circuit below is suggested by National Semiconductor in technical documentation on the LM3909....
Standard cell amplifier (CB6841E)
Found in Linear Technology documentation from the 90s, this circuit uses an operational amplifier...
10 LED Scale (CB9813E)
Found in a documentation from the 90's, this circuit uses only one integrated circuit. The...