Characteristics of CMOS Logic Inverter Amplifiers - This chart shows some of the
measured characteristics of three different unbuffered CMOS logic gates, used as voltage Amplifiers . . .
[Hobby Circuit designed by David Johnson P.E., 02/11/02]
Protects from Battery Polarity Reversal - This simple circuit can protect a
sensitive electronic circuit from an accidental connection of a battery with a reversed polarity. The
N-channel FET connects the electronic device to the battery only when the polarity is correct. The circuit
shown was . . . [Hobby Circuit designed by David Johnson P.E., 03/09/02]
Solid State Relay Requires
Only 50ua Drive Current - This circuit demands a control current that is 100
times smaller than that needed by a typical optically isolated solid state relays. It is ideal for
battery-powered systems. Using a combination of a high current TRIAC and a very sensitive low current SCR . .
. [Circuit by David A. Johnson P.E., 06/03/00]