Aleph P1.7 first pictures - Page 7

Dr Harley · 12th June 2005, 05:54 PM

J fets do not work good! You have to parallel more J fets because of 20mA is too much for one. Even You are increasing the capacitances and de amplification is lower so it does't satisfy.

If You want to improve the Aleph-P then try a nagative powersupply and DC coupling for the input. It is possible to use Cascode cirquit between de drain and current sources to reduce miller effect and increase bandwidth. You have to keep a 20 Volts between source and drain at the IRF610, then it have its best performance (very important)

promitheus · 24th June 2005, 10:34 AM

Very nice looking preamp !
Congradulations !

Check you have mail.

bbakota2000 · 21st February 2006, 05:23 PM

Hi,

If somebody has the artwork of these PCBs it would be very nice if he could send it to me at bbakota2000@yahoo.com. Thanks a lot.

acaudio · 21st February 2006, 09:40 PM

aleph_p17_supply_bottom

aleph_p17_supply_top

aleph_p17_bottom

aleph_p17_top

aleph_p17_overview

aleph_p17_supply_overview

12th June 2005, 05:54 PM	#61
Dr Harley diyAudio Member Join Date: Jun 2005 Location: IJmuiden	Re: Re: âËÂ...áÅéÇ¼Á¨ÐËÒ¨Ò¡äË¹ÅèÐ¡êÒº...ÍÔÍÔÍÔ...½ÃÑè§ÍèÒ¹ äÁèÍÍ¡ J fets do not work good! You have to parallel more J fets because of 20mA is too much for one. Even You are increasing the capacitances and de amplification is lower so it does't satisfy. If You want to improve the Aleph-P then try a nagative powersupply and DC coupling for the input. It is possible to use Cascode cirquit between de drain and current sources to reduce miller effect and increase bandwidth. You have to keep a 20 Volts between source and drain at the IRF610, then it have its best performance (very important)

21st February 2006, 09:40 PM	#64
acaudio diyAudio Member Join Date: Sep 2004 Location: Germany	aleph_p17_supply_bottom aleph_p17_supply_top aleph_p17_bottom aleph_p17_top aleph_p17_overview aleph_p17_supply_overview __________________ http://www.acaudio.de

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24th June 2005, 10:34 AM	#62
promitheus diyAudio Member Join Date: Jan 2001 Location: Germany	Very nice looking preamp ! Congradulations ! Check you have mail.

21st February 2006, 05:23 PM	#63
bbakota2000 diyAudio Member Join Date: Jan 2004 Location: Croatia	Hi, If somebody has the artwork of these PCBs it would be very nice if he could send it to me at bbakota2000@yahoo.com. Thanks a lot.

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