Simple Electronic Lock Uses Single-Transistor Circuit. May 26, 2003. ... I used a binary code of 0110100111 in my circuit. The switches are implemented in two different ways.

This is a very simple touch light switch circuit that uses the 4011 IC, one transistor and a relay. The C1 capacitor stores the switching state at a certain time and is charged or discharged according ...

The circuit in the figure shows a low-cost solution based on a transistor switch (Q1). The transistor is off under normal conditions, when the differential amplifier built around U1 amplifies the ...

This requires a transistor switch which pulls pin 11 to ground for 0.5-1 second (anything less than 5s is OK, really). I'm terribly rusty and this is where I need help. Something like the above is ...

The simple current-limiting load switch shown in Figure 1 will be familiar to most readers. In this circuit, a high level signal applied to the input switches on MOSFET Q2, which energizes the load.