Low temperature sensor (CB7814E)

Found in 90s Radio Electronics, this circuit is indicated for reading temperatures below zero.

Basic LM3914 (CC25109E)
This is the basic full-scale circuit of an LM3914 for voltage measurement or voltage triggering and...
Photo alarm with the 555 (CB6854E)
This traditional configuration with the 555 was obtained in an 80s Hands-On Electronics. The relay...
Small Bulb Surge Suppressor (CB13767E)
We found this circuit in a 1978 documentation. Its purpose is to avoid current spikes in a small...