Note: The product does not contain the L1541DAC 7220 chip. The accessories may be replaced by the same product due to the manufacturer's problem, and the performance will not be affected.
TDA1541, 7220 are installed with replacement chips
you can upgrade the original chip
L1541DAC gold fever decoder
Silver, black: finished machine
Power supply: Four high-quality sealed transformers are used to strictly distinguish digital power supply, decoding chip power supply, and LPF power supply. For the two negative voltages (-5V, -15V) of the TDA1541 chip, two transformers are used to avoid the introduction of LPF power supply loop- 15V causes cross interference!
Five groups of parallel stabilized power supply: Decoding details and dynamics are fully utilized. There are many controversies for various power supply circuits, but the shortcomings of shunt voltage stabilization are low efficiency and high cost. The quality is definitely not comparable to any series voltage stabilization. Its internal resistance, ripple, transient response time and other voltage stabilization The circuit is not on the same level.
MCU soft-controlled digital receiving: Microcomputer dynamically optimizes parameters, and adjusts the phase detector of the receiving chip (CS8416) to make it automatically adapt to the input bit rate and minimize jitter.
Indispensable digital filter: In a word, any TDA1541 decoder that does not use SAA7220 digital filter is no longer the sound of 1541.
Well-designed two-stage LPF circuit: This decoder uses four single op amps to complete a two-stage LPF low-pass circuit. This is a very important design, and its drive capability and LPF circuit characteristics are guaranteed.
The detail design is also intimate: many details determine success or failure, and the details of this decoder are not compromised. Simple operation and one-stop layout, even if the dual capacitors of the coupling output are placed in the position (for tuning), it can also reflect incomparable Attentive.
High-end and elegant appearance: Please see the actual picture for this. You can compare the decoders on Taobao. In terms of appearance, it is estimated that our L1541DAC gold is the flagship, CNC precision machining, high-end wire drawing oxidation process, laser engraving !
Fever materials: For the TDA1541 of several hundred yuan, four-sealed transformer power supply, parallel voltage stabilization, MCU soft control, and a large number of fever components (Panasonic, Philips, ELNA, Wima capacitors), we are the original design intention of sound quality first. The cost is second!
Design changes in the later tuning (very important, please refer to those who purchase the kit):
1. The SFC11F02E microcontroller with internal storage is upgraded, and the working state of the monitoring program storage and decoding adopts a more stable internal flash memory. Therefore, the external 24C02 flash memory does not need to be soldered (the small chip in the SOP8 package on the right side of the MCU), and the kit is no longer Matching.
2. There are two 1N capacitors in the LPF part, changed to Epcos 2N2.
3. The output coupling part adopts nichicon MUSE 47uf stepless capacitors or Philips axial fever capacitors, which are shipped randomly, or can be specified, canceled the original Wima parallel ELNA design.
4. The op amp can be upgraded to LT1028. I compared OPA627, LME49710 and other op amps. The LT1028 will be more suitable and the sound line will be more detailed.
Regarding sound quality: The TDA1541 chip is so enduring that it does have very obvious characteristics. It is almost the most analogous chip in cash. The high frequency is gorgeous but not frizzy, the low frequency is deep and stable, and the mid frequency is brighter. Taking the current mainstream chip's 192K bit rate to compare the parameters with 1541, in fact, in front of the 16bit 44.1K bit rate, even if it can surpass 1541 chips from the parameters, there are very few chips. It is estimated that 99% of the capable hard drives are 44.1K. CD music.
1. Electrical parameters::
Digital input: coaxial, optical, USB with L2706USB(need add 15USD )
Analog output: RCA analog output.
Digital input bit rate: 16bit, 44.1K 48K.
Analog output level: 2Vrms.
Power supply: AC220V.
2. Physical parameters:
Volume: width 220 height 52 depth 191
Weight: 2.7 kg
now not include the 1541 7220 chips ，here just for shown ，thanks
