This circuit for UHF between 800 and 1 000 MHz was found in an American documentation from the 90's. The integrated circuit is from that time, uncommon today.
This ultra-simple 9 V power source was obtained in an Argentine publication of the 1970s, but it...
This circuit is from 1967 General Electric documentation. It uses SUS which are not very common...
This differential amplifier, found in a 1964 Electronic Design, has a gain of 30. The setting can be...