AKSA's Lender Preamp with 40Vpp Output

xrk971 · 2017-11-24 10:37 pm

Harry3 said:
Sorry for not understanding the terminology.
What is a metal core board and does it use through hole components?

Metal core PCB is an aluminum substrate instead of fiberglass. It is covered with a dielectric and then a copper trace layer. It can only be used with SMT. Advantage is good heat dissipation and would be useful if you wanted to tweak to use as a preamp/headphone amp. The through hole version will have TO220 parts which can be fitted with a local heat sink so that is a good option too.

pcgab · 2017-11-24 10:50 pm

JPS64 - 2 sets w/ SMT daughterboards
Algar Emi - 1 set, SMT or TH?
Redarc12 - 1 set, SMT or TH?
CFT - 1 set, SMT or TH?
Jacques Antoine - 1 set TH
Silasmellor - 1 set THT
Bvtrinh- 1 set TH
ggetzoff - 1 set TH
tubesguy - 1 set TH
Aatto - 1 set SMT
Mordikai - 1 set TH
Johnny2Bad 1 set TH; 1 set SMT
vvs07 - 2 sets TH
Fabian85 - 1 set SMT
PCGAB - 1 Set(MB) with SMT boards.

Harry3 · 2017-11-24 10:53 pm

Thanks X

JPS64 - 2 sets w/ SMT daughterboards
Algar Emi - 1 set, SMT or TH?
Redarc12 - 1 set, SMT or TH?
CFT - 1 set, SMT or TH?
Jacques Antoine - 1 set TH
Silasmellor - 1 set THT
Bvtrinh- 1 set TH
ggetzoff - 1 set TH
tubesguy - 1 set TH
Aatto - 1 set SMT
Mordikai - 1 set TH
Johnny2Bad 1 set TH; 1 set SMT
vvs07 - 2 sets TH
Fabian85 - 1 set SMT
PCGAB - 1 Set(MB) with SMT boards.
Harry3 - 1 set MB plus TH

meanman1964 · 2017-11-25 12:27 am

JPS64 - 2 sets w/ SMT daughterboards
Algar Emi - 1 set, SMT or TH?
Redarc12 - 1 set, SMT or TH?
CFT - 1 set, SMT or TH?
Jacques Antoine - 1 set TH
Silasmellor - 1 set THT
Bvtrinh- 1 set TH
ggetzoff - 1 set TH
tubesguy - 1 set TH
Aatto - 1 set SMT
Mordikai - 1 set TH
Johnny2Bad 1 set TH; 1 set SMT
vvs07 - 2 sets TH
Fabian85 - 1 set SMT
PCGAB - 1 Set(MB) with SMT boards.
Harry3 - 1 set MB plus TH
meanman64 - 1 set MB plus THT

Wayne1 · 2017-11-25 1:01 am

JPS64 - 2 sets w/ SMT daughterboards
Algar Emi - 1 set, SMT or TH?
Redarc12 - 1 set, SMT or TH?
CFT - 1 set, SMT or TH?
Jacques Antoine - 1 set TH
Silasmellor - 1 set THT
Bvtrinh- 1 set TH
ggetzoff - 1 set TH
tubesguy - 1 set TH
Aatto - 1 set SMT
Mordikai - 1 set TH
Johnny2Bad 1 set TH; 1 set SMT
vvs07 - 2 sets TH
Fabian85 - 1 set SMT
PCGAB - 1 Set(MB) with SMT boards.
Harry3 - 1 set MB plus TH
meanman64 - 1 set MB plus THT
Wayne1 - 1 set TH

maouna · 2017-11-25 10:39 am

Hello. xrk971 can i use an alternative to BSP129 in a TO220 or TO126 package?I want to build a throughhole parts version.What alternative you suggest?

xrk971 · 2017-11-25 12:01 pm

maouna said:
Hello. xrk971 can i use an alternative to BSP129 in a TO220 or TO126 package?I want to build a throughhole parts version.What alternative you suggest?

DN2540 works well also.

thimios · 2017-11-25 1:53 pm

I see that there are two versions(smd&th) for the preamplifiers.
Is the motherboard two versions?

xrk971 · 2017-11-25 2:34 pm

No, MB is one version. That’s the beauty of JP’s modular design - you can swap different core amp “engine” boards. The TH can be fitted with heat sinks and biased at 80mA to 100mA at 24v for a headphone amp. Same is true of metal core board, but that board can use SMT and not external heatsink and run at high bias and 24v for headphone amp. Finally there is the possibility of 100v supply (changing all caps to be rated, a few resistor changes, and LTP switch to MMB5401) and get 90vpp output.

xrk971 · 2017-11-25 3:28 pm

JPS64 - 2 sets w/ SMT daughterboards
Algar Emi - 1 set, SMT or TH?
Redarc12 - 1 set, SMT or TH?
CFT - 1 set, SMT or TH?
Jacques Antoine - 1 set TH
Silasmellor - 1 set THT
Bvtrinh- 1 set TH
ggetzoff - 1 set TH
tubesguy - 1 set TH
Aatto - 1 set SMT
Mordikai - 1 set TH
Johnny2Bad 1 set TH; 1 set SMT
vvs07 - 2 sets TH
Fabian85 - 1 set SMT
PCGAB - 1 Set(MB) with SMT boards.
Harry3 - 1 set MB plus TH
meanman64 - 1 set MB plus THT
Wayne1 - 1 set TH

Looks like we are at about 22 Motherbords now, and about 14x2=28 TH daughterboards, and about 9x2=18 SMT daughterboards. Right now it is still ambiguous which daughter boards Algar Emi, Redarc12, and CFT want. Please confim choice.

Via PM, I know of at least 4 more MB's and SMT daughterboards.

No one is interested in the metal core daughterboards?

redarc12 · 2017-11-25 3:49 pm

redarc12- 1 set-HT

CFT · 2017-11-25 3:56 pm

CFT - 1 set TH

Thanks JP and X.

thimios · 2017-11-25 8:17 pm

xrk971 said:
Looks like we are at about 22 Motherbords now, and about 14x2=28 TH daughterboards, and about 9x2=18 SMT daughterboards. Right now it is still ambiguous which daughter boards Algar Emi, Redarc12, and CFT want. Please confim choice.

Via PM, I know of at least 4 more MB's and SMT daughterboards.

No one is interested in the metal core daughterboards?

X,please keep in mind that is very difficult to solder (using solder iron)on the metal core daughterboards

xrk971 · 2017-11-25 8:20 pm

Thanks for reminding us Thimios. I would only do that with solder paste and a hot plate reflow.

xrk971 · 2017-11-26 4:32 pm

Ok, looks like the number of interested people has settled down. I will go get quotes now for all the boards.

ggetzoff · 2017-11-26 5:09 pm

xrk971 said:
No, MB is one version. That’s the beauty of JP’s modular design - you can swap different core amp “engine” boards. The TH can be fitted with heat sinks and biased at 80mA to 100mA at 24v for a headphone amp. Same is true of metal core board, but that board can use SMT and not external heatsink and run at high bias and 24v for headphone amp. Finally there is the possibility of 100v supply (changing all caps to be rated, a few resistor changes, and LTP switch to MMB5401) and get 90vpp output.

Or just bias it at 80mA to 100mA for preamp.....That would be fun

Algar_emi · 2017-11-26 7:10 pm

JPS64 - 2 sets w/ SMT daughterboards
Algar Emi - 1 set, SMT or TH? I don't mind either SMT or TH, add my order to ease the GB. If it is mainly TH, then make it TH. I'm flexible. Thanks...
Redarc12 - 1 set, SMT or TH?
CFT - 1 set, SMT or TH?
Jacques Antoine - 1 set TH
Silasmellor - 1 set THT
Bvtrinh- 1 set TH
ggetzoff - 1 set TH
tubesguy - 1 set TH
Aatto - 1 set SMT
Mordikai - 1 set TH
Johnny2Bad 1 set TH; 1 set SMT
vvs07 - 2 sets TH
Fabian85 - 1 set SMT
PCGAB - 1 Set(MB) with SMT boards.
Harry3 - 1 set MB plus TH
meanman64 - 1 set MB plus THT
Wayne1 - 1 set TH

Johnny2Bad · 2017-11-26 7:42 pm

xrk971 said:
Johnny2Bad, do you mean 2 separate motherboards one each with SMT and other with TH? Or 1 motherboard and 1 set ea of SMT and TH daughterboards?

I motherboard SMT
1 motherboard TH
1 set SMT daughterboards
1 set TH daughterboards

xrk971 · 2017-11-26 7:46 pm

Johnny2Bad:
Motherboard is only TH, so do you want two TH MB’s? The daughterboards come in 3 flavors: TH, SMT, and SMT metal core.

obh · 2017-11-26 9:51 pm

2 sets w/ SMT daughterboards
Algar Emi - 1 set, SMT or TH? I don't mind either SMT or TH, add my order to ease the GB. If it is mainly TH, then make it TH. I'm flexible. Thanks...
Redarc12 - 1 set, SMT or TH?
CFT - 1 set, SMT or TH?
Jacques Antoine - 1 set TH
Silasmellor - 1 set THT
Bvtrinh- 1 set TH
ggetzoff - 1 set TH
tubesguy - 1 set TH
Aatto - 1 set SMT
Mordikai - 1 set TH
Johnny2Bad 1 set TH; 1 set SMT
vvs07 - 2 sets TH
Fabian85 - 1 set SMT
PCGAB - 1 Set(MB) with SMT boards.
Harry3 - 1 set MB plus TH
meanman64 - 1 set MB plus THT
Wayne1 - 1 set TH
obh - 1 Set(MB) plus TH

AKSA's Lender Preamp with 40Vpp Output

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