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Here is a simple AF amplifier project based on TBA820M IC. This amplifier can deliver two-watt output power with 8-ohm speaker using a 12V power supply. A 3-16V battery or an AC/DC adaptor can be used to power this circuit....
These days there a lot of audio power amplifiers in integrated circuits (ICs). But it is still interesting to produce audio power amplifiers with operational amplifiers (OAs) and with output power bipolar transistors. Some of the reasons for that...
This article describes a low-cost low noise audio distribution amplifier based on hybrid or mixed technology. Input to the amplifier is from low-noise, high-gain npn transistor. Output buffers are implemented with voltage followers using an operational amplifier (op-amp). The combination...
LM1875 is a low cost and very popular and useful integrated circuit (IC). It is designed to be stable with gain higher than ten. Its main application is stand alone audio power amplifier but with two or more additional...
Listening to music on a self-made system is great. Good-quality audio amplifier circuits can be constructed with minimum components. Described here is an LME49710 based audio amplifier. Author’s prototype is shown in Fig. 1. LME49710 based audio amplifier circuit As shown...
Here is a circuit for a simple but useful low-cost quadraphonic (having four channels) amplifier. It can be used for experiments in open or closed spaces, including small home labs and studios. It can also be used for the...
Sometimes we need configurable multichannel amplifiers for experiments or for use in offices or schools. Here is a multi mode audio amplifier circuit based on TDA1554Q, configured for multi-mode function with four channel outputs. Multi mode audio amplifier circuit The circuit...
The semi-expert techniques for automating amplifier circuit designs calls for a combination of hard specification requirements and judgement margins. A design tool must support these techniques to zero in on the appropriate operational amplifier (op amp) and external components....
FM transmissions can be received within a range of 40 km. If you are in fringe areas, you may get a very weak signal. FM DXing refers to hearing distant stations (1500 km or more) on the FM band...