Photocardiograph (CB21738E)

We found this circuit in a 1969 Popular Electronics. It measures the heartbeat by changing the transparency of the finger.

Nixie 10 Minute Timer with Nixier Tube (CB1267E)
This circuit was obtained in an old US 1974 documentation when Nixie tube displays were common. The...
New x86-Based Intel Quark Microcontroller and Developer Kit D2000
April 11, 2016 - Mouser Electronics, Inc. is pleased to announce the availability of the new...
Biestable 555 (CB6869E)
This circuit allows to activate a relay in a biestable way using a 555. The pressure switches arm and...