HIFI Class A Stereo Preamplifier Board PCB Base On Accuphase A100 Preamp Circuit

Description

Details:
Size: 180*180mm x1.6mm
The volume control interface is added, and the parallel shunt volume control circuit is used to adjust the volume more naturally and smoothly
The balance function is added. The board defaults to single-ended amplification. If you want to change to balanced amplification, it is easy to achieve and is truly balanced
Extremely wide frequency response, high degree of fax, extremely low noise, great dynamics
This board contains a class A shunt stabilized power supply, which can be directly connected to the transformer. The transformer AC output requires a four-wire output, the AC voltage can be 15V-24V, and the transformer power is at least 30W
1. The buffer stage and differential stage voltage cancel the 15V voltage regulator tube and use a parallel voltage regulator circuit. The cost is increased, the voltage is more stable, and the effect is improved.
2. The left and right channels are grounded independently, and the left and right grounds are isolated, which further increases the degree of separation.
3. Increase the size of the main capacitor, compatible with capacitors with a pitch of 7.5mm and 10mm.
4. The size and pin hole of the rectifier diode have been increased, and a larger current diode can be selected for rectification.
5. The signal input and output adopt a four-wire format, and the left and right channel signal ground wires are independent.
After connecting the transformer, adjust the output voltage first, the buffer voltage is ±15V, the main voltage
It is recommended to be ±24V.
Package included:
A100 preamplifier board pcb x 1
Not included any parts !