Low distortion audio gain limiter
The level at which the limiter kicks in audio can be adjusted with the selector knob LIMIT LEVEL. When this level is exceeded, the output of the half-LIMITING d...
2 to 4 wire audio converter
This audio converter circuit maintains 40 dB of isolation between the two halves of entry and exit of a four-line son, while allowing a line connecting two son....
HiFi expandor with De-emphasis
it can reduce its gain. The time it takes for the compressor to recover from overload is determined by the rectifier The expander eg capacitor to complete the ...
Voltage Controlled Filter SSM2044P
At this circuit the SSM2044 IC is used, a 4 pole voltage controlled filter designed for electronic music applications. On-chip voltage control of resonance allo...
Multi-Instrument Melody Generator UM34811A
This circuit is based on a preprogrammed multi-instrument melody generator IC, containing a 512-note memory capable of generating 16 tunes. The comprehensive co...
Speech Pitch Controller (MSM6322GSK)
That circuit uses the MSM6322GSK which is only available in small 24 pin plastic SOP style package. A speech pitch converter IC that operates in real time and r...
Digital Voice Recorder/Playback (UM5100)
This Circuit is based on the UM5100 which can record speech into a digital memory and then play it back. The device is designed to be used directly with static ...
Sound effects generator (UM3561)
A simple sound generator IC that can produce four sound effects. Designed for use in toys, the effects are selected by varying the connections to pins1 and 6 as...
Microphone Preamplifier with SSM 2015 P
An ultra low noise audio preamplifier particularly suited to microphone preamplification including balanced microphones. The IC features wide bandwidth, low dis...
Feedback Band-Pass Filter
One application of this handy circuit is a graphic equalizer, created by feeding a signal to a number of parallel band-pass filters each tuned to a different fr...
Audio conductivity tester with LM3909
This works with a small geleidingstestertje LM 3909. It allows a tester beeps when the resistance between the probes between 0 and 100 ? lies. Due to the volume...
Intercom Circuit with a LM1458 opamp
The example below illustrates using an op-amp as an audio amplifier for a simple intercom. A small 8 ohm speaker is used as a microphone which is coupled to the...
Super audio Reverb
Blue VALUES replaced by values in RED. Blue COMPONENTS removed from circuit. Red components added to circuit....
Mono to stereo circuit
The output voltage is = 0.707 x Vin, at the center posititon. The output voltage is = Vin, at either extreme position....
miniature audio amplifier
The amplifier is based on an integrated circuit TDA2822M. With this circuit can be built amplifier with up to 2 1 W. This much power circuit is able to supply o...
LED output from SB Live! Value
Many modern audio recorders is now compatible with digital input S / PDIF (Sony / Philips Digital Interface). Devices like CD Changers, MiniDisc recorders, comp...
Audio DAC S / PDIF (AES3) to analog
The described device is used to convert the digital signal format S / PDIF (AES3) to analog. It can be used for any device with uncompressed digital audio outpu...
Automatic Level Control Signal Circuit
Involvement is a modified version of the classic circuit of automatic level control signal used in tape recorders. The purchase price of the components (using T...
Audio Detector switch
The following circuit can be used to detect those annoying piezo whistles that one can get from Radio Shack. For the Trinity Home Fire Fighting Contest, additi...
Two way Loudspeaker cross-over
The resistance of loudspeakers is characterized in a frequency depending on the destination and their press. Loudspeakers are distinguished, as for the destina...