This crystal oscillator is indicated for the calibration of IF steps of common radio receivers. The transistor admits equivalent as 2N2222 or BF494. The circuit is from an old American publication.
This circuit allows modulating a laser diode with low frequency signals. The integrated circuit...
This AC amplifier using the 741 operational amplifier uses a dual supply from 5 to 12 V. The input...
This circuit is suggested by the Optoelectronics Sourcebook by Texas Instruments when AC signals...