This broadband amplifier was found in an Elektor from the 90's. The gain is 10 dB with a noise figure of less than 5 dB.
In the figure we have the way to use the comparator LM339 and others of the same series with the...
The presented circuit makes use of a operational transconductance amplifier (OTA). We found this...
We found this circuit in a Mullard manual from 1960. The transistor is a phototransistor of the...