Touch-on-off-electronic-switch

Transistors Q1 and Q2 control latches Q3 and Q4 to switch on the lamp. A high resistance from touching the electrode biases Q1 or Q2 on, setting or resetting the latch.

In this circuit, transistors Q1 and Q2 function as input control elements that determine the state of latches Q3 and Q4. The operation begins when a user touches an electrode, which introduces a high resistance into the circuit. This high resistance effectively biases either Q1 or Q2 into the 'on' state, allowing current to flow through the respective transistor.

When Q1 is activated, it sends a signal to latch Q3, causing it to engage and switch on the lamp. Conversely, if Q2 is activated, it will send a signal to latch Q4, which also results in the lamp being turned on. The latches serve to maintain their state even after the initial triggering signal is removed, allowing for persistent control of the lamp.

The design ensures that the system can be easily reset; if the opposite transistor is activated, it can reset the latch and turn off the lamp. This mechanism provides a simple yet effective way to control the lamp's operation through a touch interface, utilizing the properties of transistors and latches for reliable performance. The circuit layout should include appropriate resistors to limit current and protect the transistors from damage, as well as capacitors for noise filtering, ensuring stable operation during switching events.Transistors Ql and Q2 control latch Q3 and Q4 to switch on the lamp. A high resistance from touching the electrode biases Qlor Q2 on, setting or resetting the latch. 🔗 External reference