JLH1969 Circuit we all know that it is known, it is an old and familiar players, and beginners want to play the circuit; however, throughout most of the kit is mostly limited material price from a few dollars to tens of dollars, an important component also uses non-audio output capacitance, really. . . .
Which led to huge multi-player spends a great effort to do JLH1969 after they come to such a conclusion, no dynamic, no frequencies. . . . . Seems, is listening to a “voice”
Atom -JLH1969 features:
1, Mono structure, easy to use the player for about chassis cooling installation to obtain a better cooling effect, if the optional ZERO-ZONE specially made HPOO power, easily get completely independent channel dual mono, the rationale was around 100% on separation.
2, Taking into account only to do post-amplifier, this version is not superfluous to increase electronic filtering, can enhance the dynamic.
3, On the Internet using only one input coupling capacitor Nichicon MUSE BP 47UF large coupling capacitance, did not seriously studied, real fucked Shaoyou certainly sprayed with so much, the sound does not sound that no; when on the after the capacitance, will subvert your view of JLH1969 and 47U coupled, you will find no more matches this capacitor circuit.
4, Internet use only one output coupling capacitors Nichicon KG II file 3300uF, this capacitance with the input capacitance of a perfect match.
5, The feedback and the bootstrap capacitor using ELNA CERAFINE, in order to have a dynamic and intensity, the two capacitors must be on ELNA CERAFINE, but had to be newly installed (Thailand loading), it can not be an early red leather.
6, In order to make more sense of hearing ear, the feedback resistor switch AB carbon, while also joined AB input stage low carbon R value
7, The input stage transistor matching is very important, we prefer Toshiba C2240BL
8. Power tube use (Toshiba) 2SA1943 end of the tube, highlighting the sweet voice of the people.
NOTE: This a kit, All parts need you welding and testing.
The above ingredients is the series version of the school sound program with PCB magic players can also change according to the above scheme.
PS: When the pushing 6 ohm speakers, it is recommended not less than 1A current, 4-ohm speakers, it is recommended not less than 2A quiescent current, it is recommended to use a single 24V DC voltage.
The main filtering capacity of not less than 15000uF, otherwise low frequency will be affected. Bridge rectifier is recommended to do the chassis floor cooling.
Mono heat sink recommends no less than 246 * 30 * 90 (1A time)
PCB Size: 75mm*50mm
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