Can I have some comments

feniks · 23rd September 2009, 11:17 AM

I'd appreciate any comments on the design.Thank you in advance.

AndrewT · 23rd September 2009, 11:26 AM

I get the impression it might be a RIAA amp with gain.
Tell us what it is and what it is supposed to do.

It needs a buffer with gain before the RIAA EQ stage.

feniks · 23rd September 2009, 11:54 AM

Battery powered amplifier using 2x12v battery.Power 5w.

feniks · 23rd September 2009, 12:02 PM

I hope this helps:
Battery driven Pre- and Poweramp (1991/92)

Features:
Preamp designed for MC cartridges (Denon® DL103, EMT® TSD15, etc.)
Each amp driven by it's own pair of 12V/6AH sealed lead type of accumulator
Shunt-voltage-regulator to produce 11.5V for preamp and voltage amplifier section of poweramp
Power amplifier produces 4~5Watt @ 8 Ohm (comparable to single ended 2A3 or WE300B tube power amplifiers)
High efficiency speakers required (Lowther, Goodmans, Triangle, Roiene, etc. are highly recommended)
Charger circuit included

This design clearly reveals the advantages of battery driven amplifier circuits. Even they do not use sophisticated parts they do provide great sound due to the nature of the power supply. I am aware that most people are not using one of the speakers mentioned above. But in general these amplifiers are showing how far you can go with a simple circuit design combined with high efficiency speakers.

The original Hitachi® MOSFETs 2SK135/2SJ50 I have used are hard to find now. But there are a few good replacements some even using the original specifications:
ECF 10N16/10P16 (TO3) available from Profusion PLC
BUZ900/BUZ905 (TO3) from Farnell
2SK1058/2SJ162 (TOP3) from Hitachi

feniks · 24th September 2009, 06:51 AM

I am sorry for my BAD English.its hard for me to write and explain.please give your opinions about the circuit.is it worth bilding something like dis.sorry again and best of luck to all.

23rd September 2009, 11:26 AM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	I get the impression it might be a RIAA amp with gain. Tell us what it is and what it is supposed to do. It needs a buffer with gain before the RIAA EQ stage. __________________ regards Andrew T.

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23rd September 2009, 11:54 AM	#3
feniks diyAudio Member Join Date: Jun 2007 Location: Nis	Battery powered amplifier using 2x12v battery.Power 5w.

23rd September 2009, 12:02 PM	#4
feniks diyAudio Member Join Date: Jun 2007 Location: Nis	I hope this helps: Battery driven Pre- and Poweramp (1991/92) Features: Preamp designed for MC cartridges (Denon® DL103, EMT® TSD15, etc.) Each amp driven by it's own pair of 12V/6AH sealed lead type of accumulator Shunt-voltage-regulator to produce 11.5V for preamp and voltage amplifier section of poweramp Power amplifier produces 4~5Watt @ 8 Ohm (comparable to single ended 2A3 or WE300B tube power amplifiers) High efficiency speakers required (Lowther, Goodmans, Triangle, Roiene, etc. are highly recommended) Charger circuit included This design clearly reveals the advantages of battery driven amplifier circuits. Even they do not use sophisticated parts they do provide great sound due to the nature of the power supply. I am aware that most people are not using one of the speakers mentioned above. But in general these amplifiers are showing how far you can go with a simple circuit design combined with high efficiency speakers. The original Hitachi® MOSFETs 2SK135/2SJ50 I have used are hard to find now. But there are a few good replacements some even using the original specifications: ECF 10N16/10P16 (TO3) available from Profusion PLC BUZ900/BUZ905 (TO3) from Farnell 2SK1058/2SJ162 (TOP3) from Hitachi

24th September 2009, 06:51 AM	#5
feniks diyAudio Member Join Date: Jun 2007 Location: Nis	I am sorry for my BAD English.its hard for me to write and explain.please give your opinions about the circuit.is it worth bilding something like dis.sorry again and best of luck to all.

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