This circuit is from a 1978 Texas Instruments optoelectronics manual. The trimpot adjusts the LED current. Other currents can be adjusted if they are within the capacity of the FET.
This oscillator provides a 1 MHz rectangular signal determined by the capacitors used. The circuit...
Using the ICM7555, CMOS version of the 555, this circuit produces a 1 kHz signal. The circuit has...
We found this circuit generates signals from 200 Hz to 62 kHz and can be used to repel mosquitoes and...