Search Results
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 [...]
Mobile phone sniffer - gsm telephone detector
With this mobile phone sniffer will track down mobile phones. Use this handy directional finder in situations and locations where the use of a mobile phone is forbidden. This neat unit will not only detect the presence of mobile phone activity (voice or text), it can home in on the culprit!
Apart from mobile phones this [...]
