Heartbeat Detector (CB25472S)

This heartbeat sensor circuit was found in the July 1992 issue of Radio Electronics magazine. The circuit uses a 741 with a single power supply.

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Visual dial indicator (CB9300E)
This circuit was obtained in a Popular Electronics of the 90s. The circuit can be assembled with...
Digital Oil Pressure Gauge (CB25336E)
This circuit was found in the July 1990 Radio Electronics magazine. It is based on the 3-digit...
T521 High Voltage Polymer Capacitors
June 2017 - Kemet T521's new high voltage capacitors with capacitances up to 330 uF and voltages...