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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

AKSA's Lender Preamp with 40Vpp Output
AKSA's Lender Preamp with 40Vpp Output
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Old 21st November 2018, 01:12 AM   #891
BRN is offline BRN  United States
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Does the pot need to be 10k or can a 25k or 50k used?
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Old 21st November 2018, 04:41 AM   #892
xrk971 is offline xrk971  United States
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AKSA's Lender Preamp with 40Vpp Output
Any of those pots will work.
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Old 21st November 2018, 01:34 PM   #893
marconi118 is offline marconi118  Germany
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Quote:
Originally Posted by marconi118 View Post
can I use the transistors of the v2.0 for the HV in the regular version?
will it reduce the preformance (thd)?
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Old 21st November 2018, 07:09 PM   #894
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AKSA's Lender Preamp with 40Vpp Output
The V2.0 SMT transistors will have similar THD, although I have seen that the SMT layout may have lower THD than the TH version. Use of metal thin film transistors for the outputs and feedback makes a difference though. Do not use metal oxide resistors on the feedback.
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Old 21st November 2018, 07:10 PM   #895
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AKSA's Lender Preamp with 40Vpp Output
The Melbourne M2X DB

The diyAudio First Watt M2x
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Old 22nd November 2018, 08:18 AM   #896
marconi118 is offline marconi118  Germany
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Quote:
Originally Posted by xrk971 View Post
The V2.0 SMT transistors will have similar THD, although I have seen that the SMT layout may have lower THD than the TH version. Use of metal thin film transistors for the outputs and feedback makes a difference though. Do not use metal oxide resistors on the feedback.
Do you mean resistors?

I saw that in the normal version, in the HV version, in the M2 hybrid version and in the M2X doughter board, the transistors are different.

AS I will go with the hybrid M2 version without edcor and with only 3 transistors, best to use are?

BC857
BC556
2N5401
KSA992
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Old 23rd November 2018, 12:35 AM   #897
xrk971 is offline xrk971  United States
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AKSA's Lender Preamp with 40Vpp Output
Sorry, meant resistors. I think my phone autocorrected that.

They all work about the same. 857 same as 557 butnin SOT23.

KSA992 is high Hfe but pins different than BC.
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Last edited by xrk971; 23rd November 2018 at 12:37 AM.
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Old 23rd November 2018, 08:06 AM   #898
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I have in stock BC559C low noise but max 30V Vce and Vcb

can I use them? should match them for Hfe
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Old 23rd November 2018, 03:32 PM   #899
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Quote:
Originally Posted by marconi118 View Post
I have in stock BC559C low noise but max 30V Vce and Vcb

can I use them? should match them for Hfe
They will work fine, just match Hfe.
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Old 23rd November 2018, 03:35 PM   #900
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AKSA's Lender Preamp with 40Vpp Output
Melbourne DB for M2X progress is coming along:
AKSA Lender Pass Hybrid M2 (ALPH-M2) Amp-mel-smd-pba-bot-v2-png

AKSA Lender Pass Hybrid M2 (ALPH-M2) Amp-mel-smd-pba-top-v2-png
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