Gday all. I bought a cheap Chinese megaphone a year or so ago, had some fun with it out 4wding, but being cheap it broke being made of junk plastic. Its the usual one with four buttons, the first is power, second is music, third and fourth is record and playback of a few seconds of speech.
Anyway, im making a new housing for the horn speaker from aluminium, and want to start from scratch with the driver electronics.
I reverse engineered as best as possible the original electronics. It became hard due to two COB cards which are non-identifiable. One contains the musical tune and the other is the voice recorder i assume.
The amp that was used is the A2025 16-pin package. In the datasheet for this IC, it mentions a max output of 5watt. Is this the usual max a hornspeaker can take, I would think it could take at least 20watt? Assuming it is, i was thinking of using the TDA1905 which i can get from my local Jaycar which is also a 5W amp IC seemingly similar to the A2025.
Hooking the 1905 is simple enough using an electret mic, but what i also want to do is also play music thru the megaphone from an iPod or similar source. This is where i get confused, how can I feed sources from both a mic, and a mp3 jack into the amp? Am i correct in assuming that the mp3 player is too big a signal for the amp?
Thanks for any help you can give.
Anyway, im making a new housing for the horn speaker from aluminium, and want to start from scratch with the driver electronics.
I reverse engineered as best as possible the original electronics. It became hard due to two COB cards which are non-identifiable. One contains the musical tune and the other is the voice recorder i assume.
The amp that was used is the A2025 16-pin package. In the datasheet for this IC, it mentions a max output of 5watt. Is this the usual max a hornspeaker can take, I would think it could take at least 20watt? Assuming it is, i was thinking of using the TDA1905 which i can get from my local Jaycar which is also a 5W amp IC seemingly similar to the A2025.
Hooking the 1905 is simple enough using an electret mic, but what i also want to do is also play music thru the megaphone from an iPod or similar source. This is where i get confused, how can I feed sources from both a mic, and a mp3 jack into the amp? Am i correct in assuming that the mp3 player is too big a signal for the amp?
Thanks for any help you can give.