Tag Circuit Ideas

Audio amplifier using TDA1554

The TDA1554Q is an integrated class-B output amplifier in a 17-lead single-in-line (SIL) plastic power package. The circuit contains 4 x 11 W single-ended or 2 x 22 W bridge amplifiers.

Audio amplifier using PAM8403

This is a basic circuit idea of making audio amplifier using PAM8403 chip. Note that this is readily available as a module. But if you need to try your hands on it or want to modify it following circuit may…

How to make your own relay module

What is a relay? A relay in an electromagnetic device that is activated by a low voltage ranging from 3-12 v. When the electromagnet is activated it pulls a contact to make or break high voltage circuit. A simple relay…

On-Off Switch using relay

Here’s how industrial equipment is started and stopped using push buttons(On-Off Switch). The circuit is called a “locked-out relay.” It uses an ordinary relay and the ON switch activates the relay to close the terminals. When the switch is released,…

Simple Battery Charger

Here is a very simple example of a low-cost battery charger for 12 v 7Ah lead-acid batteries. As shown in the figure, diodes 1N4001 (D1) and 1N4001 (D2) form a full-wave rectifier. The rectified voltage appears across SCR1 and the…

LED Torch with adjustable brightness

The Led torch with adjustable brightness circuit uses LM3914 as the basis of a 10 step variable brightness current-regulated white LED . This circuit has only four components in the control and regulation circuit: R1,R2, VR1 and LM3914. Part List 1.…