Hi

I have a circuit that I picked up as a kit from Maplin. The circuit works by turning the LED on if there is no 38khz IR beam detected. If a 38khz IR beam is detected, the LED shuts off.

I have a few questions about the layout of the design. I want to know if the R3, C7, R6, and R7 combination a filter circuit leading into the transistor?
The IC3 is a IR receiver. I read somewhere that the 1N4006 is a high speed switching diode. Because the IR receiver is picking up a frequency of 38kHZ does that mean that the diode is allowing a logic zero current through?


D2: 1N4006
IC3: TSOP2438
Q1: BC558
Q2: BC548

R2: 100R
R3: 220K
R4: 220K
R5: 10K
R6: 220K
R7: 220K
R8: 330R

C6: 4U7
C7: 100n

 

Looks like the diode is part of a simple RC glitch filter that serves to quickly discharge C7.

The diode can be any switching diode, 1N4148 for example, the 1N4006 part is a high-voltage diode, not quite necessary for this circuit.

 

Ok cool, do you know where I can find more information about it?

 

Ok cool, do you know where I can find more information about it?

Can you be a bit more specific? Which "it" are we talking about?