This is one of the many versions of this type of indicator that the reader can find on our website. This is from Mullard's 1969 documentation. The indicator is 95 uA (100 uA).
We found this easy start circuit in Electronics Now magazine from December 1993. The frequency is...
We found this circuit in an old American documentation. The circuit can be applied to modern...
This differential amplifier, found in a 1964 Electronic Design, has a gain of 30. The setting can be...