We found this micro amplifier in a technical documentation from National Semiconductor. The circuit can be used on an experimental phone, being powered even by alternative power sources.
In the figure we have a differentiator with the LM3900 transconductance amplifier. The circuit is...
Found in Signalite documentation from the 1960s, this circuit generates ladder pulses. The circuit...
A 25 mVpp applied to the input of this circuit produces in the output a 1 Vpp signal. The...