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.
We found this circuit in a 70s EDN. The circuit makes use of operational of the time. | Clique na...
This source was published in the year 2000 and is indicated for period devices with currents of 3...
This 50's setup has a balance control. The transistors are germanium types of the time, and the...