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Phone ringer Schematic – Circuit Schematic
Phone ringer Schematic
The circuit consists of 6 building blocks and the first is the inverter between pins 1 and 2. This forms a low frequency oscillator with a 1u and 1M + 2M2 resis...
Electronic Siren with 2 transistors – Circuit Schematic
Electronic Siren with 2 transistors
This project is built on the third section of the PC board, identified by "SIREN" and "Project 5." You will notice the similarity between this circuit and the L...
Piezo Buzzer driver – Circuit Schematic
Piezo Buzzer driver
This is a basic Buzzer driver circuit with resonance frequncy approximatly 5 Khz, 85 dBA. It operates on 3 to 28 v DC at 6mA....
Vocal Zapper – Circuit Schematic
Vocal Zapper
All vocal eliminators start with the assumption that the lead vocal in a recording is in the center of the stereo field - which means that it is equal amplitude...
Stereo Channels Controller – Circuit Schematic
Stereo Channels Controller
The circuit includes Better channel separation, resulting in an increased stereo effect, as well as reduced noise and hum. This schematic will allow you to canc...
Univibe - Trem Face and Others – Circuit Schematic
Univibe - Trem Face and Others
Where it really shines is in the univibe. The 'vibe uses a dual section, reverse log taper pot that's just a bit easier to find than a dinosaur's tooth. If we n...
Auto Microphone Muter – Circuit Schematic
Auto Microphone Muter
If you've crossed the line and play guitar or bass and also sing in a band, you're almost certain to have run into the situation that you step away from the mik...
Color Organ schematic – Circuit Schematic
Color Organ schematic
The basic idea of the project is to make different colored bulbs light at different frequencies of music. The circuit connects to the speaker outputs of your s...
Audio Attenuator – Circuit Schematic
Audio Attenuator
Two low voltage, low power zeners are used to control electronically the level of an audio signal. The attenuation range is from 6 to 58dB for an input current ...
Low pass filter for Subwoofer Circuit – Circuit Schematic
Low pass filter for Subwoofer Circuit
The application that to you we propose is a simple filter of region that limits the acoustic region (20-20000Hz) in the region 20-100Hz. With the manufacture th...
Stereo Preamplifier and Bass-booster – Circuit Schematic
Stereo Preamplifier and Bass-booster
This preamplifier was designed to cope with CD players, tuners, tape recorders etc., providing a gain of 4, in order to drive less sensitive power amplifiers. A...
Analogue VU meter – Circuit Schematic
Analogue VU meter
This circuit can drive analog moving coil meters, for use as a VU meter. The circuit is left connected to the line terminals of the amplifier. The VU meter wo...
Subwoofer filter schematic – Circuit Schematic
Subwoofer filter schematic
If you like me more bass in your stereo like, you can turn a subwoofer there. This is a speaker that only the bass frequencies. Below is a circuit to ensure tha...
RIAA phono preamplifier NE5532 – Circuit Schematic
RIAA phono preamplifier NE5532
If you still like to spin vinyl and features a turntable, but the amplifier has no more input for a turntable is below a switching solution. We used a NE5532 ...
Audio Tone control in Line amplifier – Circuit Schematic
Audio Tone control in Line amplifier
This rule allows the amp volume, balance and tone controls to take. The circuit operates a specially designed IC, LM 1036. The advantage is that few external co...
Audio Peak / Beat LED indicator – Circuit Schematic
Audio Peak / Beat LED indicator
This indicator can be used, or see if your speakers can be damaged by the noise power. With P1 you can set the limit to which D1 LED lights. The pot is 100k he...
RIIA Phone attenuator / Filter – Circuit Schematic
RIIA Phone attenuator / Filter
In older amps is usually a phono input. Today, this used less and less, and it would be useful if the input and line input can be used. This circuit goes. The ...
Microphone Preamplifier with 5532 NE – Circuit Schematic
Microphone Preamplifier with 5532 NE
This is a good example preamplifier for microphones that can be used in mixing consoles. The circuit uses a dual op-amp, type NE 5532. The amplifier must be ...
10 LED Audio Amplifier Power-meter – Circuit Schematic
10 LED Audio Amplifier Power-meter
This indicator lets you see how much power an amplifier produces. The circuit uses an LM 3915, the logarithmic variation of the known IC LED VU Meter LM 3914. ...
9V Speaker polarity Checker – Circuit Schematic
9V Speaker polarity Checker
In a stereo system is often whether the speakers are polarized. This is especially a problem if the cable has no polarity. This circuit will help with the prope...