Crystal low frequency oscillator (CB7533E)

Found in an RF Design from the 90's this circuit is intended for crystals of less than 1 MHz. Transistors are types of general use today.

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Wavemeter (CB15830E)
We found this circuit in an old documentation from the 70s. The text is the original one of the...
Thermocouple Amplifier (CB17615E)
The circuit shown in figure is suggested by Maxim in an application note. The operational...
10 W-Transistor Amplifier II (CB998E)
We found this amplifier in a 1990 documentation. The transistors are common, having been made...