Home Recording Live Sound circuit

This circuit utilizes the ZTX450 and ZTX550 transistors configured in a push-pull output stage. The following measurements were recorded at maximum volume: Input: 0.4 mV rms, Output: 1.8 V rms, Voltage gain: 4500, Maximum output before distortion: 2.25 V rms,...

Unity-Gain Four-Input Audio Mixer Circuit

The circuit has four inputs. The voltage gain between each input and the output is maintained at unity by the relative values of the 470 kΩ input resistor and the 470 kΩ feedback resistor. The described circuit operates as a voltage...

Low-noise pre-equalizer circuit

Figure 3-16 illustrates a low-noise preamplifier equalizing circuit using the HA12017. This circuit includes playback components R3, R4, and C4, which conform to a standard balanced network. The gain of the circuit is -7dB at 1kHz, while the output signal...

Simple Car Preamplifier and Artificial Earth

The preamp circuit is completely conventional, and by necessity is AC coupled throughout. The artificial earth is derived by two resistors (R1 and R2), which will set the "earth" at exactly 1/2 the supply voltage. This is nominally 13.8V in...

Lm318 Microphone preamplifier with tone control circuit and explanation

This electronic project is a simple microphone preamplifier based on the LM318 operational amplifier. The LM318 is configured as a standard non-inverting amplifier. Resistor R1 provides a ground reference for the bias current of the non-inverting input. The combination of...

Build a Microphone Polarity Tester

Many things can go wrong in a modern recording studio, but few are as difficult to track down as reversed microphone polarity. When a microphone is placed in front of a sound source, a positive pressure on its diaphragm caused...

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...

Computer microphone circuit diagram

The sound card for a PC typically includes a microphone input, speaker output, and occasionally line inputs and outputs. The microphone input is specifically designed for dynamic microphones, accommodating an impedance range of 200 to 600 ohms. An adaptation has...

preamp circuit 3

During a Digital Projects Lab, the professor suggested incorporating more circuit-level work into a project. To achieve this, a preamplifier was designed, which included an infrared (IR) remote control to replace a previously built version. The earlier preamplifier functioned well...