Archive for June, 2008
Basic infrared transmitter
This infrared tranmitter is intended for use with this infrared receiver.
It works with 2 - 1.5V batteries or a 3V lithium battery. To give a compact assembly and still a good frequency stability, the circuit uses a oscillator with outpashing network. Current consumption depends on power supply and duration as S1 remains pressed. When [...]
Infrared switch operated by remote
SFH505A made by Siemens combine infrared diode receiver, amplifier, demodulator and a filter band pass for minimizing interferences. This circuit work together with this infrared transmitter.
The output signal of IC1 has the impulse duration limited to a maximum value. This fact is exploited by the associated transmitter for obtaine a maximum radius [...]
Autodisconnection for audio equipment
This simple circuit disconnects equipment rack of your audio in case has not delivered a sound a specified period. Circuit is operated by pressing his S1, which produces loading of C1. Further, switch IC1b AO exit in the state “up” and the audio equipment is powered from the network through semiconductor relay [...]
