This flasher circuit consists of an astable multivibrator with the frequencies given by the capacitors. The circuit is from 1965 using light bulbs, but LEDs can be used. Power comes from 4 batteries.
This small FM transmitter, with a few tens of meters in range, is powered by a 9 V battery. The...
This filter was obtained from the Texas Instruments Linear Circuits Applications. It makes use of...
Figure 1 shows a simple audio oscillator driven by the SCR When the sensor is closed. The circuit...