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electronic circuit help

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bcktang

New Member
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

New Member
Any circuits/diagrams we can look at?
 

Nigel Goodwin

Super Moderator
Most Helpful Member
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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