This circuit was found in a documentation of the 80s, having didactic purpose. For R1 values between 10k to 1M can be used. Transistors are general purpose types.
This experimental good sensibility radio was obtained from a 1968 magazine. The magazine no longer...
This circuit is based on the bistable configuration, but with the difference that the values of...
We found this circuit in a 1977 publication. With it we can test general purpose operational...