This circuit was found in an American publication in 1966. The circuit uses a general-purpose FET that admits an equivalent. The instrument is a 250 uA full-scale microammeter.
This circuit is suggested by the Optoelectronics Sourcebook by Texas Instruments when AC signals...
This circuit can be used as a shield based on 555. The calculation of the timing network is done...
This circuit, from an old ON Semiconductor publication, suggests a shield to excite an LED from an...