Nvarcher HDAM IV LPF Open Loop Current Transfer Module for Marantz TDA1541 TDA1541A

With reference to some application circuits of Marantz HDAM, we have designed this IV module by combining our own design of open-loop IV current transfer module.

Current input, zero (midpoint) auto-servo, input and output without capacitance

In order to verify the effect of HDAM SA SA2 SA3, we made separate prototypes and chose HDAM SA as the module with the most open sound and the best sound flexibility.

Sound characteristics:

Compared with the op-amp or negative feedback type sound field is much larger, clear details, low-frequency elasticity is outstanding, clear layers, especially suitable for the performance of large dynamic and large compilation of music

Note:

1. Be sure to power off the operation, or there is a risk of damage to the TDA1541 chip

2. signal pin power polarity must not be wrong

3. 1541 current output feet are 6 feet (R) 25 feet (L), 5 feet analog ground, modified when you need to disconnect the output 2 feet and other circuits

4. Because it is an open-loop circuit design, there may be some background noise inevitably

5. This module is a zero-point dynamic servo adjustment, there will be a burst of sound at the moment of power on, please pay attention to the boot sequence, first open the CD, then open the decoder, then open the preamp, preamp volume to a minimum, then open the amplifier, shut down the amplifier first, remember remember!

The following SA2 SA3 modules are designed according to the official Marantz drawing parameters

The following SA modules are used and are designed according to the official Marantz drawing parameters

Will be made by hand soldering using CARDS solder wire

How to use:

In order to make it easy to install this module even if it is not our DAC, the following auxiliary board is specially designed

and the base plate is fixed, you can use the copper column or something fixed