Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
There is no voltage rating on the transformer.. It just stated E1-48 220V..
Also there is no model number in the speaker.. Its an old one.. Here's the image of the board inside..
---------- Post added at 18:01 ---------- Previous post was at 17:58 ----------
Sorry for a bad quality image.. And i dont know to follow the schematic in the circuit.. Will be happy if someone gives me an idea about how to draw a PCB circuit by seeing the board... Will try to post a good quality image soon..
---------- Post added at 18:04 ---------- Previous post was at 18:01 ----------
In the board its printed as SP-6200 series.. I googled it and found no results related to speaker...
Do you have the power transformer for it?
does it write any voltage near the supply plug or in the back of the speaker or on the PCB near the power supply plug?
Another option would be to see if you can read the amp IC it uses and check the datasheet for recommended operation voltage.
Its written no where on the PCB... There is also no voltage specification on the speaker box.. The Amplifier IC is situated inside that heat sink.. Thought of not giving any trouble to the circuit...;-);-)... Want to break that heat sink in order to see the model number of the IC... So is there any other way.. Or should i give 5V DC power first and then increase from then on...??????//
---------- Post added at 18:35 ---------- Previous post was at 18:34 ----------
My transformer got burned up... Thats the problem here...
You'll need above 9V (stable DC) in case of a bridge amplifier to source 10W@4ohm. So 12V is a more likely number. You also should verify, if the amplifier configuration is actually using a bridge configuration.
In a bridge configuration, both speaker terminals would be biased at mid supply and connect directly to an amplifier IC. In single ended configuration, one output is most likely grounded and the other connected through a large capacitor.