Buffer with MOSFET (CB26318E)

This boost amplifier was found in a Popular Electroniics from the 90s. The circuit operates up to 20 MHz depending on the coils used.

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High impedance amplifier (CB7449E)
Suitable for the use with sensors, this circuit from National Semiconductor appears in other...
OR gate with the LM3900 (CB4032E)
The circuit presented emulates an OR gate with the LM3900, operational transconductance amplifier....
Source follower (CB7471E)
This circuit has a very high input impedance and a very low output impedance. We found it on a...