I am using a TLP434A trasmitter and receiver with a HT12E and HT12D encoder and decoder. This circuit works great when I hook it up to a 5V wall power supply but when I try to hook the transmitter part up to a cell phone battery (4.4V), the encoder and oscillating resistor get really hot. I’m sure they would burn up if I didn’t disconnect the circuit within a minute. Do you know why this is happening and what I can do to be able to use some kind of long term battery such as this with this encoder? Also, I am using a 1Mohm resistor on the encoder and a 20k on the decoder. Thank you.
Some things to check… on the 5v supply, insert a small resistor between the supply and the circuit. Measure the voltage across this sense resistor and calculate the current that is going into your circuit. Pay particular attention to the transient (in-rush) current.
Then, lookup the specs on your battery. It may be that the battery is not able to source this much current. Also, check for grounding issues. A schematic would be helpful if none of the above seem to help you. I have worked with the HT12D/E chips before and they were running fine on a battery powered application.
HI tre…
can u send me da schematic of your circuit??
i’m working on da same…still i cudn’t get it working…
i’ve gone through the datasheets of HT12e n HT12d…
n tried the 2 application circuits given in dat…
still din’t workk…
thank you,
Russell