This is a project circuit for infrared receiver that is the IR detectors output signal feeds data to the input of the TXLC-315 RF transmitter module through the 2N3906 PNP transistor inverter circuit. This circuit is existing infrared remote control transmitter for the TV. Here’s the project circuit figure of the IR receiver.
We need this inverter circuit since the TXLC-315 data input needs to be held at ground during idle (non-transmit) periods. The output of the TSOP-1140 IR detector idles at logic 1. Applying this logic 1 directly to the TXLC-315 data input would cause the TXLC-315 RF transmitter to always be ON. We don't want this. We only want incoming data from the IR transmitter to turn ON the RF transmitter to re-create the same signal the IR transmitter is sending. That's the purpose of the PNP inverter circuit. In essence, we're simply turning IR into RF since the IR detector output will now modulate our RF module thereby re-creating the same signal, but now it's RF instead of infrared.
We need this inverter circuit since the TXLC-315 data input needs to be held at ground during idle (non-transmit) periods. The output of the TSOP-1140 IR detector idles at logic 1. Applying this logic 1 directly to the TXLC-315 data input would cause the TXLC-315 RF transmitter to always be ON. We don't want this. We only want incoming data from the IR transmitter to turn ON the RF transmitter to re-create the same signal the IR transmitter is sending. That's the purpose of the PNP inverter circuit. In essence, we're simply turning IR into RF since the IR detector output will now modulate our RF module thereby re-creating the same signal, but now it's RF instead of infrared.
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