Sawtooth oscillator (CB21816E)

This transistor circuit was found in Mullard's 1960s transistor manual. The transistors are germanium from the time.

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Temperature sensor 0 to 50º C degrees (CB10172E)
This circuit uses a transistor as a sensor and operates in the range of 0 to 50º C. We found it in...
Band-Pass Filter (CB14921E)
This circuit was found in a Poptronics of the 90's. The components can be changed to the desired...
Reverse polarity protection circuit (CB21582E)
In the figure we have an interesting protection bridge against power polarity inversion of a...