Hey
evandude thanks!
My board is not small as yours but, yes i do have a
**broken link removed**, is a prototype not a final version, moust components are
under the board.
The photo of the first circuit is the original headbanger version, the second photo is the final prototype based on the improved version of headbanger (my schematic). As you can see i did not yet add a metal shield because is a prototype (yet based on my schematic), the final version will have that shield and will be small as your board that i will build with
SMD components and the transformer/power circuit will be build outside from the main board.
To shield the board i will add 4 ceramic capacitors like specified in the schematic, TOP, BOTTON, LEFT and RIGHT near out side the board (all centered) from RGND to the metal shield, yet to prevent oscilation of the circuit and prevent noise.
I did not have any problem with the GND,
note that all external conectios are made with shielded cabes, I just put all together
BUT check the power supply, i had many problems with noise ripple (humm, hisss, buzzz) that was loud when used with any AC adapters. I know that the circuit looks wrong (R1/D1) but without the components as specified in the power supply schamatic it will feed the circuit with noise. Some people told me that i dont need the 100R in the GND or the D1, but if removed the humm will increase.
I did a few tests with 9v battery and SONY NP-FM50 InfoLithium type M battery, the circuit still very stable, no oscilation and with the same sound quality, but before I do any more tests with battery, the main circuit is finished and i will try not change it, i will add a
**broken link removed** like many portable devices has to boost battery performance.
I tell you this
evandude i have past the last two months in this circuit trying to get the best result possible (audioguru knows and help me alot
), using this circuit with for example a SONY Discman with "Mega Bass" turned on you will get a impressive, high quality sound yet with good punching BASS.
If you build this circuit let me know :wink: