Help
Hello everyone,
Once again I'am here trying to get advise from you, hoping that you may be able to help me.
The IR Repeater circuit I constructe worked, but in only 2 first stages, meaning it catched the ir light and the 555 timer made 38kHz and the output resistor had sequere pulses when sening the signal, but the led didnot flash and the IR leds didnot retransmitte the ir signal...
May be the reasone is when I took the circuit home to try it in front of the TV , I bought 12 dc voltage battery(TOPCO) it is supply by electricity, any way I have DMM at my place and when I measured the voltage it was 18V without a load and 16.5V when i connect it to the circuit , and I measured the IN pin voltage of the voltage regulator , it was 10.5V , but it must be 12 volt in order for the circuit to work, is it why the IR transmitter didnot work?
should i connect 6V batteries in series without the Voltage regulator?
How can i know the polarity of the IR leds? and I used BC549B instead of
BC549C , and C33725 instead of BC337 , does it make a difference in the circuit or why it did not work probilbly?
The circuit is in:
http://english.cxem.net/infrared/ir7.php
Please help me