This Schmitt trigger in current mode for frequencies up to 50 MHz was found in a 1969 Motorola manual. Appropriate switching transistors can be used.
This circuit uses a transistor as a sensor and operates in the range of 0 to 50º C. We found it in...
This circuit was found in a Poptronics of the 90's. The components can be changed to the desired...
In the figure we have an interesting protection bridge against power polarity inversion of a...