just check value and pin-out on the pcb and compare it with schematics. the pcb has been done for 2SA-2SC transistors,but still...you can never be too careful.
how it sounds? no need to worry about sound,just carefully match input transistors and enjoj it!
http://www.youtube.com/watch?feature=player_detailpage&v=FiHZDGdxmJg#t=320
http://www.youtube.com/watch?v=IySabZcD-EU
http://www.youtube.com/watch?v=FMLYshEJq-k
i speak serbian,but you will be able to hear at least a bit the sound of it and what you shoud expect.
how it sounds? no need to worry about sound,just carefully match input transistors and enjoj it!
http://www.youtube.com/watch?feature=player_detailpage&v=FiHZDGdxmJg#t=320
http://www.youtube.com/watch?v=IySabZcD-EU
http://www.youtube.com/watch?v=FMLYshEJq-k
i speak serbian,but you will be able to hear at least a bit the sound of it and what you shoud expect.
Last edited:
just check value and pin-out on the pcb and compare it with schematics. the pcb has been done for 2SA-2SC transistors,but still...you can never be too careful.
how it sounds? no need to worry about sound,just carefully match input transistors and enjoj it!
APEX HV23 uradio/done by HomeMadeAudioProject III. - YouTube
APEX HV23 uradio/done by HomeMadeAudioProject II. - YouTube
APEX HV23 uradio/done by HomeMadeAudioProject I. - YouTube
i speak serbian,but you will be able to hear at least a bit the sound of it and what you shoud expect.
thanks for your advice ...
Finished .... one module. I connected power supply (Vcc 60-0-60 of my amp) and comes out a strong background noise together with the music. Noise is also present in the absence of music. It 'a problem of GND, I made some mistakes?
help me.!
noise problem, solved ...
Now there is no background noise, but the sound is not clear how it comes out distorted, and rustling ...... perhaps during the test I unfortunately touched some cable ..... hell ....
Bias current (voltage measurements on 0R47/5W)?
unfortunately, .
unfortunately, ... during the test, a wire "GND", touched on the -75 VDC terminal of the amp .... the result was a strong burning smell comes out of the speaker (thankfully old) ...... now make measurements ...
If you want to test amplifier without protect use about 100uF bipolar cap in series with speaker.
Unfortunately it does not work correctly, you .... I am making a general check ...
I have a question, as indicated on the schematic, I have to put a bridge or is it just for HV350?
Unfortunately it does not work correctly, you .... I am making a general check ...
I have a question, as indicated on the schematic, I have to put a bridge or is it just for HV350?
You must put this wire jumper on all versions
2x50v AC 500VA for mono 1000VA for stereo and you need extra 20v AC 1A for protection.