This circuit is used in VHF and UHF superheterodyne receivers. The circuit is from the 1964 RCA transistors manual. Equivalent transistors such as the BF495 can be used.
This circuit was found in the ON Semiconductor's Thyristor manual of the 1980s. The high quality...
Suggested by an Electronic Engineering, this circuit uses components of the time. Modern...
The transistor used in this circuit is uncommon today. AC124 or equivalent such as AC188K and...