This audio peak detector allows a pair of stereo channels to be monitored on a single LED. Identical circuitry is used in the left and right channels. Use is made of the switching levels of... Read more
This energy saving, a 12-V controller is nearly universally applicable. In addition to controlling battery powered lighting in a car, boat or caravan it is also quite able to control the spe... Read more
Elsewhere in this collection of small circuits, a 1-dB version of a third-order Chebyshev filter can be found. This 3-dB version is a bit steeper after the corner frequency. The inherent dis... Read more
This circuit arose from the need to couple the outputs of two CDROM drives to the input of a single sound card. Simply ‘stacking’ the connectors is possible but not particularly elegant, and... Read more
Most of the analog audio media, including radio broadcasting, stick within 60 dB dynamic boundaries. This VU Meter was designed to be used as a desktop instrument with home audio appliances,... Read more
This circuit is intended as an extension for (pre-) amplifiers, to increase the number of inputs. Ever since the introduction of MD-recorders, DVD players, etc., the owners of older amplifie... Read more
In the LT1567 Linear Technology (www.linear-tech.com/ pdf/1567i.pdf) has produced a component specially developed for building analog filters with cutoff frequencies up to 5 MHz. It contains... Read more
This circuit was originally designed as a simple mains intercom for use in the home. To complete the circuit you could use the ‘Mains Remote Transmitter’. We have to admit that our tests wit... Read more
This circuit should be considered as more of an experimental circuit for AM demodulation, than as a practical application. In the associated ‘AM modulator’ we have raised the problems caused... Read more
This compact design forms a remotely operated switch that receives its control signal via the mains voltage. The switch is operated using the ‘mains remote transmitter’ described elsewhere i... Read more
