We found this circuit in the Texas Instruments optoelectronics manual. Field effect transistors can be BF245 and bipolar BC548. The sensor is a photodiode in the photo-generator mode.
With the components indicated, the circuit oscillates at 20 MHz. The coils and capacitors can be...
We found this preamplifier circuit with high input resistance, on the order of 30 M ohms, in an...
This symmetrical 1.2 to 35 V source was found in a 1994 documentation. The integrated circuits are...