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passive riaa preamplifier – Circuit Schematic
passive riaa preamplifier
There are two types of pre-amplifiers for magnetic phono cartridges. An example of the most common type is the one described in the March 2002 issue of SILICON ...
multimedia riaa preamplifier – Circuit Schematic
multimedia riaa preamplifier
Even if a large number of album titles once available on vinyl are now, little by little, being proposed as CDs, not all are available and far from it. You may ...
frequency multiplier for lf – Circuit Schematic
frequency multiplier for lf
When designing bass reflex loudspeaker cabinets, it is necessary to measure the resonance of the speaker to an accuracy of about 1%. To do this, you need an aud...
melody generator for – Circuit Schematic
melody generator for
This tiny circuit comprising of a single 3 terminal IC UM66 can be built small enough to be placed inside a greeting card and operated off a single 3V flat butt...
sound source locator uses – Circuit Schematic
sound source locator uses
This circuit could be regarded as a simple alternative to the Sooper Snooper device featured elsewhere in this issue. It is based on the PreChamp preamplifier f...
one ic two tones siren with – Circuit Schematic
one ic two tones siren with
This circuit is intended for children fun, and can be installed on bicycles, battery powered cars and motorcycles, but also on models and various games and toys...
whistle responder schematics – Circuit Schematic
whistle responder schematics
Some 20 years ago it was common to see small key-holders emitting an intermittent beep for a couple of seconds after its owner whistled. These devices contained...
small general purpose audio – Circuit Schematic
small general purpose audio
This is a small general purpose audio test set. It comprises a low 0. 3% distortion phase shift oscillator and a level meter. The level meteris set at 100mV FSD...
fet audio mixer – Circuit Schematic
fet audio mixer
As many or as few channels as are required can be added to the mixer. Do this by just duplicating the input "sections" which are clearly shown on the schematic....
digital volume control – Circuit Schematic
digital volume control
Using a dual polariity power supply (+-5V works fine) will cure most clipping problems. You will have to check the data sheet for the correct pins to connect yo...
Stereo preamplifier with bass circuit – Circuit Schematic
Stereo preamplifier with bass circuit
This preamplifier was designed to cope with CD players, tuners, tape recorders etc. , providing an ac voltage gain of 4, in order to drive less sensitive power ...
telephone call voice changer – Circuit Schematic
telephone call voice changer
This design fulfills these requirements by means of a variable gain microphone preamplifier built around IC1A, a variable steep Wien-bridge pass-band filter cen...
portable mixer block diagram – Circuit Schematic
portable mixer block diagram
The image below shows a Block diagram of the entire mixer that includes four Input Amplifier Modules followed by four in-out switchable Tone management Modules,...
car subwoofer filter using op – Circuit Schematic
car subwoofer filter using op
Here is the circuit diagram of simple and easy subwoofer filter which will be operated from a 12V DC supply. Such a circuit is incredibly helpful in Car subwoof...
headphone monitor amp – Circuit Schematic
headphone monitor amp
This simple amplifier is ideal for adding a headphone jack to equipment that lacks this feature. The Headphone Buffer circuit board is small enough (1. 2" X 1. ...
fet audio mixer schematics – Circuit Schematic
fet audio mixer schematics
This simple circuit mixes two or more channels into one channel (eg. stereo into mono). The circuit can mix as many or as few channels as you like and consumes ...
mic audio circuit – Circuit Schematic
mic audio circuit
It can be used as part of intercoms, walkie-talkies, low-power transmitters, and packet radio receivers. Transistors T1 and T2 form the mic preamplifier. Resist...
compressor microphone – Circuit Schematic
compressor microphone
The FM Remote Control Receiver` (available on this website in Infra-red circuits section) has a connector where an analogue output is made available. To make a ...
sensitive microphone circuit – Circuit Schematic
sensitive microphone circuit
The figure below shows a schematic of a very interesting sensitive mic circuit which will boost faint sounds from distance. The circuit is quite sensitive and p...
microphone preamp circuit – Circuit Schematic
microphone preamp circuit
Here is a schematic of a very sensitive microphone preamp circuit, which can be used to increase gain of microphone or boost the audio signals coming from micro...