Receiver hardware for IR beam (red eye)?

[Tinue]

I was wondering if new hardware has shown up since this article has been written: https://www.mh-aerotools.de/hp/red-eye/H...rduino.pdf

The "HP C4103A IR Transceiver Unit" is increasingly difficult to get. In Switzerland, the cheapest one I found was about 50 US$, and there was only one available.

So far I tried a burst detector and an IR transistor. The burst detector VS/1838B works more or less (a few errors from time to time), but it stops after one second. It's built for remote controls, and apparently thinks someone is sitting on the remote and thus shuts off.

The photo transistor is just way too slow to detect a 32kHz signal.

So I was wondering if someone found another receiver in the meantime. Either a "raw" receiver detecting the individual 32kHz pulses, or a burst detector that signals the 6-8 pulse bursts. The software I am using can deal with both types of detectors.