Amplifier of Acoustic Frequencies with Preamplifier
https://www.electronics-lab.com/project/amplifier-of-acoustic-frequencies-with-preamplifier/
Characteristics Input Voltage: 15V Output Power: 4,2Wrms @ 4Ohm Minimal input signal: 94mVp-p with preamplifier, 0,65Vp-p without the preamplifier Parts R1 2,2K R2 330K R3 4,7K – logarithmic potentiometer R4 330K R5 1K R6 1.5Ohm C1, C6 100nF polyester C2 100uF/25V electrolytic C3, C7 1uF/25V electrolytic C4 1000uF/25V electrolytic C5 10uF/25V electrolytic Q1 BC547 U1 TDA2002 LS1 speaker […]
Sound Level Meter
https://www.electronics-lab.com/project/sound-level-meter-2/
This nifty sound level meter is a perfect one-chip replacement for the standard analog meters. It is a completely solid state and will never wear out. The whole circuit is based on the LM3915 audio-level IC and uses only a few external components. Parts Notes V+ can be anywhere from 3V to 20V The input […]
FET Audio Mixer
https://www.electronics-lab.com/project/fet-audio-mixer-3/
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 very little power. The mixer is shown with two inputs, but you can add as many as you want by just duplicating the “sections” which […]
Digital Volume Control
https://www.electronics-lab.com/project/digital-volume-control-2/
This digital volume control has no pot to wear out and introduces almost no noise in the circuit. Instead, the volume is controlled by pressing UP and DOWN buttons. This simple circuit would be a great touch to any home audio project. Parts: C1 – 0.1uf Ceramic Disc Capacitor U1 – DS1669 Digital Pot IC (See Notes) […]
10W Mini Audio Amplifier
https://www.electronics-lab.com/project/10w-mini-audio-amplifier-2/
You can use this powerful amplifier in any small audio project. It is very small (6.5 x 4.5 cm) and it outputs 10W using a 9V battery. Parts List TDA2003 Datasheet
20 to 80 Seconds Voice Record Playback
https://www.electronics-lab.com/project/20-to-80-seconds-voice-record-playback/
This project is a 20 to 80 seconds Voice Record – Playback module based on ISD1740 IC. Project has been designed to record & playback multi voice massages using Winbonds ISD1740IC. Messages are stored in flash memories made in unique Multilevel Storage Technology (MLS). Circuit provides high quality audio recording and simple operations. Circuit […]
RF
https://www.electronics-lab.com/article/rf/
General
https://www.electronics-lab.com/article/general/
Communication
https://www.electronics-lab.com/article/communication/
Microcontrollers
https://www.electronics-lab.com/article/microcontrollers/