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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 [...]
Preselector for SW receivers
The entry low capacitance of MOSFET modern, with two gates, will create negative inverse reaction through a uncoupled source resistor. Applied right this technique allows the creation of a entrance RF stage field with a relatively high dynamic range.
Radio amateur working on short wave: there is no need to tell, in the days of our [...]
