Sunday, 29 December 2019
Wednesday, 25 December 2019
The Ultimate Design
High End Preamplifier Module for TA-E901 Sony #ESPRIT Replacement
All Resitors are 1206 SMD Thin Film 1% Tolerance
Two Layers PCB
Last Generation #BJT and J-FET
Tuesday, 28 May 2019
Thursday, 3 January 2019
How to made an economic High End Preamplifier.
My Auna CD508 project: from Hi Fi power amplifier to High End Preamplifier with Phono MM and MC.
The original amplifier has a switching power supply, the input selector is made by CD4052 and power amplifier is made by Texas Instruments AB class IC, LM1875 in bridge connection. The power rails voltage are +16/0/-16 Vdc and it as some features like tone control, BT connection balance, remote control , motorized volume knob, output relay, 3 inputs(4 with BT) , a tape recording output and a headphones out.
Estimated power output on 8ohm should be around 50W/CH.
|Amplifier Auna AV2-CD508BT before mod|
I dismounted the power amplifier section and I made a substitution with my Espritaudio Preamplifier modules: ESPRE
|Preamplifier Auna AV2-CD508BT after mod|
|Bridge connection of LM1875|