The circuit is as simple as it is effective. It is connected in parallel with the bell and powered by a 3-V supply formed by two 1.5-V penlight batteries connected in series. The doorbell memory draws ...

The schematic for the Musical Doorbell using UM66T is given below. The doorbell circuit consists of a UM66T, two BC547 transistors, an 8-ohm speaker, and a couple of resistors and capacitors.

This low-cost, simple, reliable, and effective circuit for a doorbell works without touching. It can be quite useful in our post-Covid-19 world as it minimises the spread of virus through doorbells.

Simple Intercom Circuit A Simple Intercom Circuit. Both the sets used are identical in construction. When one set (say, party 1) is switched on, the other set’s (party 2’s) bell energises When party 2 ...

The circuit is too simple and battery operated It uses the popular melody generator IC UM3481. The circuit uses the popular melody generator IC UM3481 . It generates music tones like Jingle bell, ...

A simple text-based Block Diagram Compiler for Continuous System Simulation. Learn to program an Analog Computer using this digital simulator. Can run real-time simulations with ADC inputs and DAC ...