NOS TDA1541 DAC | DIY AUDIO

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MEASURES

Rails: +/- 24VDC under load
DC offset at speaker teminals: +/- 2mV
BIAS: 1.3A (0.61V on R13/R14)
Voltage gain: 10 (20dB)
THD+N (at 1 Watt into 8 Ohms at 1kHz): 0.08%
THD (at 1 Watt into 8 Ohms at 1kHz): 0.04%

MEASURES

Rails: +/- 24VDC under load
DC offset at speaker teminals: +/- 2mV
BIAS: 1.3A (0.61V on R13/R14)
Voltage gain: 10 (20dB)
THD+N (at 1 Watt into 8 Ohms at 1kHz): 0.08%
THD (at 1 Watt into 8 Ohms at 1kHz): 0.04%

NOTES

R7 changed to 52.3k to remove excess negative DC offset at the output of the amp
R4 changed to 8.2 Ohms and 220uF bipolar capacitor added to remove DC offset at Edcor input (pin 1)
Boards, Edcor transformers and MOSFETs from TeaBag
Harris IRFP9240 MOSFETs
Matched Toshiba JFETs from FET Audio
Dual mono implementation
2 x 250VA transformers from Toroidy - 230V primary, 2x18V secondary
8 x 22000uF KEMET PEH200 in power supply
Deluxe 4U chassis from Hi-Fi 2000

RESOURCES

Manual: First Watt M2
diyAudio: Official M2 schematic, M2 Clone boards with 120mm UMS spacing
Other: Edcor

Last update: 10.03.2019.

NOTES

R7 changed to 52.3k to remove excess negative DC offset at the output of the amp
R4 changed to 8.2 Ohms and 220uF bipolar capacitor added to remove DC offset at Edcor input (pin 1)
Boards, Edcor transformers and MOSFETs from TeaBag
Harris IRFP9240 MOSFETs
Matched Toshiba JFETs from FET Audio
Dual mono implementation
2 x 250VA transformers from Toroidy - 230V primary, 2x18V secondary
8 x 22000uF KEMET PEH200 in power supply
Deluxe 4U chassis from Hi-Fi 2000

RESOURCES

Manual: First Watt M2
diyAudio: Official M2 schematic, M2 Clone boards with 120mm UMS spacing
Other: Edcor

Last update: 10.03.2019.

NOS TDA1541 DAC

Non-oversampling digital to analogue converter based on TDA1541A chip. Main components and features:

Cirrus Logic CS8414 Digital Audio Receiver
Phillips TDA1541A 16-bit DAC
No digital filtering
Discrete D1 I/V converter
Separate mains transformers for digital board and I/V

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D1 I/V SCHEMATICS

PL D1 OS.png

PL D1 OS PSU.png

LINKS

diyAudio forum: NOS TDA1541 + D1 I/V & output stage, Zen I/V Converter
Lampizator: TDA1541A DAC chip corner
Various: nos TDA1541 tube DAC, DutchAudioClassics

Last update: 11.06.2023.

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