build a door alarm

Yes they get it from North Korea and Pakistan these days. Stop trying to wind me up Peter.

Today I got a chime module from (I think) a 1997 Polo. It has the same chime that 00000k wants. It's relay number 39 p/n 1HO919433A. The only difference between it and the (older) #49 relay is the "A" and the #49 instead of #39 (on the top of the relay - ie, on the speaker grill), but the #49 1HO919433 has a totally different sound. Internally they are very different but the 1HO919433A uses a hybrid circuit with an SMD LM3903 chip (comparator) and looks to be reverse engineerable. (Surely some VAG site has?)

Again, stop trying to wind me up!

LOL. Nah - the wind up comes with the request for the circuit. Then the build. Then the comment that it would have been cheaper to buy a Polo etc, or fly to a car wrecker.

We would have stood a chance if:- a) OP knew what the heck he was talking about. b) A decent grasp of English. I've helped Egyptians, Iraqis I told them straight I was Jewish, no problems, but,they had a very good grasp of English. Mid 20th. century onwards and for say another 30 years you MUST have good English for science/engineering. It will swing to Mandarin plus Hebrew and Hindi, except in Israel and India, English is the de-facto 2nd. language.