This circuit was obtained in an Electronics World of 1968. The operational amplifiers ones are types of the time, no longer used today. The circuit responds from less than 20 Hz.
This different configuration of AM radio with push pull detection and amplification provides good...
This light intensity meter is from a 1978 Texas Instruments optoelectronics manual. The...
This circuit fires a xenon lamp being powered by a 300 V battery. The circuit is from a Radio...