Hello, thank you very much for this.

Sorry if this sounds dumb but just to make sure I understand the circuit correctly.
1. The "EBC" is the infrared light source
2. There is an IR transistor before the 22k resistor
3. Then an LED after the 1k resistor, this LED then lights up when IR is detected?
4. You have called the whole thing an "IR Monitor" or am I missing another component?

The "EBC" is a picture looking towards the bottom of the transistor that is shown in the circuit diagram. The whole thing is indeed a non-calibrated IR monitor circuit. The device labeled "VM" is a voltmeter of whatever kind you have available, probably with a range of between 0-2 and 0-5 volts DC. The greater the intensity of the infrared light hitting the IR phototrsnsistor the greater the voltage reading. and at some level of intensity the LED would illuminate. Probably the circuit will also work with an IR photodiode in place of the photo transistor.

 

The "EBC" is a picture looking towards the bottom of the transistor that is shown in the circuit diagram. The whole thing is indeed a non-calibrated IR monitor circuit. The device labeled "VM" is a voltmeter of whatever kind you have available, probably with a range of between 0-2 and 0-5 volts DC. The greater the intensity of the infrared light hitting the IR phototrsnsistor the greater the voltage reading. and at some level of intensity the LED would illuminate. Probably the circuit will also work with an IR photodiode in place of the photo transistor.

Thank you MisterBill