How many times have you wished that there was a simple way to turn on that sub-woofer or some other piece of audio equipment, simply by sending it a signal? This ability is fairly common in commercial subs and some other gear, but there seems to be a complete absence of circuits on the net, and they seem completely unavailable as an add-on device. The circuit presented here will operate with a signal of 10mV, which will be adequate for all but the quietest listening. Even then, 10mV represents a ty...
I recently decided to install a HAM radio in the car and needed a way to mix my radio’s audio signal with my stereo’s audio signal. I wanted to avoid any active (powered) mixing because that would add complexity and signal degradation to the circuit. I also didn’t want to spend too much money on parts and have to wait for them to be shipped. I looked into several pre-made passive mixers to get some ideas and possibly to pick one up if it wasn’t terribly expen...
Most cards of sound in computer, are deprived stereo input for microphone, on the contrary have stereo input for high level [ Line ]. The circuit uses the input Line of card of sound, in order to we place a two mono stereo microphone, in the input of card of sound. Simultaneously he is more functionnal, after we have the possibility of regulating the gain of stage of microphone and regulating the final level of sound externally and independent for each channel of microphone. This solution was selected in or...
Sure, listening to VHF FM has great advantages over MW/LW AM from the old days — now we have bright stereo free from interference, fading and noise! However, your FM radio will no longer predict the arrival of a thunderstorm as did the AM radio many years ago-reliably and hours before the trouble was upon you! The crux is that AM detection will faithfully reproduce the effects of lightning and other massive static discharges approaching in a very simple way: they’re audible as slight crackling noises in...
