Using junction FETs, a configurable configuration is achieved for very low frequencies. FETs can be of almost any type and the frequency depends on the capacitors.
This circuit allows controlling a LASER pointer with an input logic signal. R has 10 ohm for 3 V...
Figure bellow shows how the 4510 can be cascaded for counts higher than 10. The circuit shows the...
This type of circuit is interleaved between a microphone and a transmitter in order to improve the...