This adjustable frequency circuit was found in December 1986, Radio Electronics magazine. The base frequency is given by C1 and the power supply must be 5 V.
This circuit allows the use of a common cassette to pass the tape recordings to other media with...
The integrated circuit, in this 1986 application, is not a very common component today. The...
This TTL pulse stretcher or stretcher was found in a 90's EDN. The time constant R x C1 determines...