electronic circuit help - Electronic Circuits Projects Diagrams Free

bcktang · 13th December 2004, 04:32 PM

need help
ok, i have an 4 bit data encoder, fed to an IR transmitter,
n at the other end, and IR receiver - an amplifier - decoder,

i cannot get back the signal i encoded,
i can get it only when my multimeter +ve probe touches the leg of the receiver, or the leg of the amp output, ...........why ????????
n i m really blur now, can anyone explain ???

TheOne · 13th December 2004, 04:44 PM

Any circuits/diagrams we can look at?

**Nigel Goodwin** · 13th December 2004, 05:00 PM

Yes, your question is far too vague.

Are you modulating the IR at 38KHz, and using an IR receiver IC?, if so you need to feed it's 5V supply through a series resistor with a decent sized decoupling capacitor near to the chip.

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13th December 2004, 04:32 PM	(permalink)
bcktang	electronic circuit help need help ok, i have an 4 bit data encoder, fed to an IR transmitter, n at the other end, and IR receiver - an amplifier - decoder, i cannot get back the signal i encoded, i can get it only when my multimeter +ve probe touches the leg of the receiver, or the leg of the amp output, ...........why ???????? n i m really blur now, can anyone explain ???

13th December 2004, 04:44 PM	(permalink)
TheOne	Any circuits/diagrams we can look at?

13th December 2004, 05:00 PM	(permalink)
Nigel Goodwin	Yes, your question is far too vague. Are you modulating the IR at 38KHz, and using an IR receiver IC?, if so you need to feed it's 5V supply through a series resistor with a decent sized decoupling capacitor near to the chip. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk