Microphone Preamplifier – Sound Sensor
https://www.electronics-lab.com/project/microphone-preamplifier-sound-sensor/
This is an easy to construct dual-stage microphone pre-amplifier. The project can be used as a sound sensor or microphone pre-amplifier. The 1st op-amp pre-amplify the very low-level signal coming from the condenser microphone and 2nd op-amp provides more boost to the audio signal. The pre-amplifier is an important building block for many audio communication […]
4 Channel Analog Video Distribution Amplifier
https://www.electronics-lab.com/project/4-channel-analog-video-distribution-amplifier/
The project presented here is a low-cost video distribution amplifier capable of driving up to four video lines. The amplifier is configured with a non-inverting gain of 2. The input video source is terminated in 75 Ohms and is applied to the high impedance non-inverting input. Each output line is connected to the op-amp’s output […]
1.2V-25V/10A Adjustable Power Supply Using Power Op-Amp
https://www.electronics-lab.com/project/1-2v-25v-10a-adjustable-power-supply-using-power-op-amp/
This is a small size power supply based on OPA549 power op-amp that provides output voltage 1.2V to 25V with 0 to 10A adjustable current limit. Two onboard trimmer potentiometers provided to adjust the voltage and current, LED D1 is over temperature indicator. The circuit works with input supply of 30V DC and logic supply […]
Tiny Professional Microphone Preamplifier
https://www.electronics-lab.com/project/tiny-proffesional-microphone-preamplifier/
This board has been designed around INA217 low distortion, low noise instrumentation amplifier. The INA217 is ideal for low-level audio signals such as balanced low-impedance microphones. Many industrial, instrumentation, and medical applications also benefit from its low noise and wide bandwidth. Unique distortion cancellation circuitry reduces distortion to extremely low levels, even in high gain. […]
Low noise Mini Electret Microphone PreAmplifier
https://www.electronics-lab.com/project/low-noise-mini-electret-microphone-preamplifier/
This single supply microphone pre-amplifier amplifies the output signal of an electret capsule microphone to audio line levels. An op-amp is used as a trans-impedance amplifier to convert the output current from the microphone into a signal-level voltage. The circuit works with 9V so it is a good choice for battery-operated systems. Features Supply 9V […]