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 interface was found in a Modern Electronics magazine from 1990. Although the circuit is...
We found this simple mixer in a 90s Radio Electronics. The used FETs are still common. The inputs...
This modulator circuit for low intensity signals is from old documentation. The integrated circuit...