intercom schematic | Next Electronics

Referring to the simplified schematic in A, the audio frequency generator (AFG) consists of 10 relatively simple circuit elements. IC1-c and IC1-d are configured as unity-gain non-inverting buffer amplifiers. The summing amplifier, IC2-c, combines equal amounts of the left and...

LM390 Bass Amplifier

This circuit is a mono audio amplifier that will boost low frequencies as you see at the frequency response. The circuit is suitable for driving a subwoofer speaker for example. The output power of the circuit is about 1 Watt...

40 Watt Audio power Amplifier LM3876

This Circuit is based on the LM3876. A 11-pin plastic package IC with high performance audio power amplifier, an output mute function which can be used to eliminate switch-on and switch-off "thumps" to the loudspeaker load. It is capable of...

22W Stereo Amplifier Using TDA1554

This document presents a 22-watt stereo audio power amplifier circuit diagram based on the TDA1554 integrated circuit from NXP Semiconductors (formerly Philips Semiconductors). The 22-watt stereo audio power amplifier circuit utilizing the TDA1554 IC is designed to deliver high-quality audio amplification...

Mike Pads

What got me interested in building these diminutive devices is the S3FM connector assembly made by Switchcraft. The S3FM is simply a 3.5-inch tube fitted with a male XLR at one end and a female at the other, with enough...

Audio Voice-Over Circuit

This circuit prioritizes a microphone and preamplifier (voice circuit) over any other audio signal, functioning similarly to a one-way intercom. When the push-to-talk switch is activated, the main amplifier switches from music to the voice signal. Essentially, a voice-over unit...

45 Watt Class-B Audio Power Amplifier

The goals were achieved by utilizing a discrete-components operational amplifier (op-amp) driving a complementary common-emitter output stage configured for Class B operation. In this configuration, for small output currents, the output transistors remain off, allowing the op-amp to supply all...

Intercom

This intercom utilizes a single audio integrated circuit (IC) as a two-way amplifier, with the speakers functioning as microphones. A single 6-volt supply is sufficient to provide adequate audio volume. The intercom system operates on a straightforward yet effective design, leveraging...

Low-Cost and Simple Intercom

This is a low-cost and simple intercom circuit design that utilizes three transistors. Even a novice can assemble it on a piece of veroboard without difficulty. The intercom circuit is designed to facilitate two-way audio communication between two locations. The core...