I redrew my schematic to use an NPN transistor, as I stocked a lot more of those. When I wired the circuit on a breadboard, it did not work correctly. The lights stayed lit and flickered when the circuit received a signal. I added an optoisolator to act as a NOT gate, but that failed. I pulled all the wires and stepped through the construction using green LEDs at each sub-circuit to confirm that it was working. The problem was that I was crossing sinking/sourcing logic. The infrared receiver sent a LOW signal when it received data, which was ideal for sensors, but an NPN transistor would constantly light the LEDs with this type of signal. When I switched to a PNP transistor, the devices were compatible, and the LEDs would only turn on when the receiver detected a signal.
When I used the circuit as a repeater, I had no usable results. The system would not turn on my television when I used a known-good remote to activate the amplifier. My taggers did not respond to a repeated signal either. As a last resort, I opened one of my remotes and removed the built-in LED. I ran test wires from the terminals directly to the transistor and watched the indicating LED illuminate. The circuit worked this way, which is disappointing since I will have to build a new case for it and cannot use the repeater with a Flipper Zero.
The rest of the posts for this project have been arranged by date.
First time here?
Completed projects from year 1
Completed projects from year 2
Completed projects from year 3
Completed projects from year 4
Completed projects from year 5
Completed projects from year 6
Completed projects from year 7
Completed projects from year 8
Completed projects from year 9
Completed projects from year 10
Completed projects from year 11
Completed projects from year 12
Disclaimer for http://24hourengineer.blogspot.com and 24HourEngineer.com
This disclaimer must be intact and whole. This disclaimer must be included if a project is distributed.
All information on this blog, or linked by this blog, is not to be taken as advice or solicitation. Anyone attempting to replicate, in whole or in part, is responsible for the outcome and procedure. Any loss of functionality, money, property, or similar, is the responsibility of those involved in the replication.
All digital communication regarding the email address 24hourengineer@gmail.com becomes the intellectual property of Brian McEvoy. Any information contained within these messages may be distributed or retained at the discretion of Brian McEvoy. Any email sent to this address, or any email account owned by Brian McEvoy, cannot be used to claim property or assets.
Comments to the blog may be utilized or erased at the discretion of the owner. No one posting may claim property or assets based on their post.
This blog, including pictures and text, is copyright to Brian McEvoy.
2025-11-07
When I used the circuit as a repeater, I had no usable results. The system would not turn on my television when I used a known-good remote to activate the amplifier. My taggers did not respond to a repeated signal either. As a last resort, I opened one of my remotes and removed the built-in LED. I ran test wires from the terminals directly to the transistor and watched the indicating LED illuminate. The circuit worked this way, which is disappointing since I will have to build a new case for it and cannot use the repeater with a Flipper Zero.
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| Four infrared LEDs and one green indicator light |
The rest of the posts for this project have been arranged by date.
First time here?
Completed projects from year 1
Completed projects from year 2
Completed projects from year 3
Completed projects from year 4
Completed projects from year 5
Completed projects from year 6
Completed projects from year 7
Completed projects from year 8
Completed projects from year 9
Completed projects from year 10
Completed projects from year 11
Completed projects from year 12
Disclaimer for http://24hourengineer.blogspot.com and 24HourEngineer.com
This disclaimer must be intact and whole. This disclaimer must be included if a project is distributed.
All information on this blog, or linked by this blog, is not to be taken as advice or solicitation. Anyone attempting to replicate, in whole or in part, is responsible for the outcome and procedure. Any loss of functionality, money, property, or similar, is the responsibility of those involved in the replication.
All digital communication regarding the email address 24hourengineer@gmail.com becomes the intellectual property of Brian McEvoy. Any information contained within these messages may be distributed or retained at the discretion of Brian McEvoy. Any email sent to this address, or any email account owned by Brian McEvoy, cannot be used to claim property or assets.
Comments to the blog may be utilized or erased at the discretion of the owner. No one posting may claim property or assets based on their post.
This blog, including pictures and text, is copyright to Brian McEvoy.
2025-11-07
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