Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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DIY Gaincard Anyone? (Dan W)

195.223.99.185

Posted by Emir on November 6, 2000 at 06:20:35

Under http://www.sakurasystems.com/ you can see:
*World's shortest NFB loop length 9m/m (including the length of the resistor )

What this mean? Can anyone is able to solder DIRECTLY around 3mm length? SMD resistor between pin 3 and 8 of LM3875 (which is around 9 mm length)?

On the other side it's possible to solder SMD between pin 2 and pin 4 on TDA2050 or LM1875 (length is ~3.5 mm) but that mean TDA2050 and LM1875 are not correct IC's? In the same time you have shortest NFB loop (less than 9mm)!

I finished both CopyCards with LM1875 and TDA2050 with PSU with two 200W (VAC) - 2X20V toroids (DM 35,00 each here in Sarajevo) and with two 35A rectifiers.
My friends told me that LM has better highs with excellent stereo separation (only with TWO toroids connected + DACT CT2 attenuator) but little on the bright side and TDA Copy(Clone)Card has better low end and fuller sound (less transistors inside maybe?).

What do you think about LM4701T with 90 dB Open Loop Voltage Gain / MUTE-STANDBY function / 9-lead TO-220 package (or 8 lead if you know that pin 3 and pin 5 has the same function -Vee supply) / Power Supply Volts from 20 to 64(!)Volts?!?

Good Luck!

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