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Author Topic: First Watt B1 Buffer Preamp  (Read 2401 times)

Offline Engr. Dacuycoy

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First Watt B1 Buffer Preamp
« on: May 03, 2012, 10:26:08 AM »
Why I want this?
1.The impedance mismatch that makes your tunes sound mushy.
2.A lack of output voltage means that you have to crank up your stereo volume to get a decent listening

Just completed my Buffer Preamp for my ipod.. the problem is the 10uF caps
meron kaya available nito sa pinas?

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I'm a Mechanically trained, electronic to me is just an hobby and if I can do it, so can you!
Don't get discouraged by those so called "EXPERT"! I can tell you most of the time they "TALK" only but with no practical results.
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First Watt B1 Buffer Preamp
« on: May 03, 2012, 10:26:08 AM »

Offline Engr. Dacuycoy

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Re: First Watt B1 Buffer Preamp
« Reply #1 on: May 03, 2012, 10:34:15 AM »
http://beavishifi.com/projects/JFET_preamplifier/



ito sana kaso wala akong makitang MPF102
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I'm a Mechanically trained, electronic to me is just an hobby and if I can do it, so can you!
Don't get discouraged by those so called "EXPERT"! I can tell you most of the time they "TALK" only but with no practical results.
Seldom people succeed the first time, just keep on trying!

Philippine Electronics Forum

Re: First Watt B1 Buffer Preamp
« Reply #1 on: May 03, 2012, 10:34:15 AM »

Offline fantom_mayonaise

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Re: First Watt B1 Buffer Preamp
« Reply #2 on: May 03, 2012, 11:10:10 AM »
mukang 'boutique' capacitor po yata kailangan nyo?

Try nyo din sa e-gizmo. Got this from their site

550106300 10uf/630v           10uF/630V RIFA Cap.                        A    
580001361 15UF/250V           Polyester Film Cap.                        A    

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Philippine Electronics Forum

Re: First Watt B1 Buffer Preamp
« Reply #2 on: May 03, 2012, 11:10:10 AM »

Offline Engr. Dacuycoy

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Re: First Watt B1 Buffer Preamp
« Reply #3 on: May 03, 2012, 11:16:31 AM »
ayon.. matanong nga yan +1  ;D
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I'm a Mechanically trained, electronic to me is just an hobby and if I can do it, so can you!
Don't get discouraged by those so called "EXPERT"! I can tell you most of the time they "TALK" only but with no practical results.
Seldom people succeed the first time, just keep on trying!

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Re: First Watt B1 Buffer Preamp
« Reply #3 on: May 03, 2012, 11:16:31 AM »

Offline fantom_mayonaise

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Re: First Watt B1 Buffer Preamp
« Reply #4 on: May 03, 2012, 11:46:37 AM »
expect them to be relatively expensive sir. Pa-post na din price dito pag na-inquire nyo.

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Re: First Watt B1 Buffer Preamp
« Reply #4 on: May 03, 2012, 11:46:37 AM »

Offline efren

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Re: First Watt B1 Buffer Preamp
« Reply #5 on: May 03, 2012, 12:05:07 PM »
Quote from: Engr. Dacuycoy on May 03, 2012, 10:34:15 AM
http://beavishifi.com/projects/JFET_preamplifier/



ito sana kaso wala akong makitang MPF102
seeing this post made me rummage through my vintage trannies colection


there they are!


gold pins...kinda cute :D
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Offline Engr. Dacuycoy

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Re: First Watt B1 Buffer Preamp
« Reply #6 on: May 03, 2012, 12:11:00 PM »
wow so lucky naman sis efren. baka pwede bilhin ko na yan kahit yong used na  ;D ;D ;D
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I'm a Mechanically trained, electronic to me is just an hobby and if I can do it, so can you!
Don't get discouraged by those so called "EXPERT"! I can tell you most of the time they "TALK" only but with no practical results.
Seldom people succeed the first time, just keep on trying!

Offline efren

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Re: First Watt B1 Buffer Preamp
« Reply #7 on: May 03, 2012, 12:13:47 PM »
just the shipping cost you can have 'em ;)
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Offline duc_tech

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Re: First Watt B1 Buffer Preamp
« Reply #8 on: May 03, 2012, 12:23:02 PM »
@Engr. Dacs

interested ako sa pre amp na to kaya lang ang ginamit na JFET na MPF102
ito yung datasheet (RF Amp ^_^)
 
mukhang ito lang yung available na jfet sa bin ng gumawa nito ...

ito sa bin ko meron akong JFET (2sk117) for replacement ,for audio amp talaga,
image from datasheet:


balak kung ilagay sa DR100w amp...thanks sa share..
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Offline Engr. Dacuycoy

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Re: First Watt B1 Buffer Preamp
« Reply #9 on: May 03, 2012, 12:40:38 PM »
Quote from: efren on May 03, 2012, 12:13:47 PM
just the shipping cost you can have 'em ;)

ygpm

@duc_tech
pwede siguro yan adjust lang sa biasing
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I'm a Mechanically trained, electronic to me is just an hobby and if I can do it, so can you!
Don't get discouraged by those so called "EXPERT"! I can tell you most of the time they "TALK" only but with no practical results.
Seldom people succeed the first time, just keep on trying!

Offline efren

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Re: First Watt B1 Buffer Preamp
« Reply #10 on: May 03, 2012, 12:53:30 PM »
the JLH 1996 & 2005 revisions employ VHF RF trannies, no issues encountered regarding sound quality...
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Offline abeTIR

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Re: First Watt B1 Buffer Preamp
« Reply #11 on: May 03, 2012, 12:59:23 PM »
Quote from: Engr. Dacuycoy on May 03, 2012, 10:26:08 AM

.. the problem is the 10uF caps
meron kaya available nito sa pinas?



you can ask gerry morales, the last time I went there binigyan niya ako ng isa "bonus" pang-test daw 10uf/600v metallized poly..

sa DEECO I've seen on the shelf 6.8k 250v metallized poly din, mukhang mura lang naman.

+1 ganda ng PCB.. ;D
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Offline efren

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Re: First Watt B1 Buffer Preamp
« Reply #12 on: May 03, 2012, 01:08:24 PM »
sa deeco marcos highway meron Nichicon 10uF/25V non-polar, packed in two's for less than 20Pesos. malamang marami din yan sa ibang branch or store other than deeco.
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Offline n0th1n6

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Re: First Watt B1 Buffer Preamp
« Reply #13 on: May 03, 2012, 01:12:18 PM »
Sir efren, pwede rin po makiamot ng mpf102? Gusto ko rin gumawa ng guitar preamp gamit JFET.
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Offline duc_tech

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Re: First Watt B1 Buffer Preamp
« Reply #14 on: May 03, 2012, 01:19:27 PM »
Quote from: efren on May 03, 2012, 12:53:30 PM
the JLH 1996 & 2005 revisions employ VHF RF trannies, no issues encountered regarding sound quality...

thanks sir efren for the info's
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Offline efren

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Re: First Watt B1 Buffer Preamp
« Reply #15 on: May 03, 2012, 01:25:09 PM »
Quote from: n0th1n6 on May 03, 2012, 01:12:18 PM
Sir efren, pwede rin po makiamot ng mpf102? Gusto ko rin gumawa ng guitar preamp gamit JFET.

hingi ka nalang kay engr Dacs, nakuha na nya, dun nya kukunin sa bahay ni sir tony ;)
alam ko pupwede kahit di mpf102, mag aadjust ka nga lang ng mga biasing resistors, meron pa ako dito 2pcs 2N5458 general purpose N channel Jfet 25V, 16mA isabay ko narin dalhin kung type mo,.
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Offline fantom_mayonaise

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Re: First Watt B1 Buffer Preamp
« Reply #16 on: May 03, 2012, 01:35:20 PM »
Quote from: abeTEER on May 03, 2012, 12:59:23 PM

sa DEECO I've seen on the shelf 6.8k 250v metallized poly din, mukhang mura lang naman.


may nakita din akong ganyan sa deecon cubao. di ko alam kung paano basahin yung 6.8K. paano nga ba?
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Offline abeTIR

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Re: First Watt B1 Buffer Preamp
« Reply #17 on: May 03, 2012, 01:49:01 PM »
^ reads 6.8uf k is for tolerance..correct me if i'm wrong...
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Offline n0th1n6

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Re: First Watt B1 Buffer Preamp
« Reply #18 on: May 03, 2012, 06:58:55 PM »
Aw nakuha na pala. Kung di na umabot sir ok lang po. Ngayun lang kasi uli ako nakapag login. Baka umorder na lang ako ng J201 sa element14.
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Offline tony

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Re: First Watt B1 Buffer Preamp
« Reply #19 on: May 03, 2012, 07:18:20 PM »
Quote from: fantom_mayonaise on May 03, 2012, 11:10:10 AM
mukang 'boutique' capacitor po yata kailangan nyo?

Try nyo din sa e-gizmo. Got this from their site

550106300 10uf/630v           10uF/630V RIFA Cap.                        A   
580001361 15UF/250V           Polyester Film Cap.                        A   



ako meron...... :D :D :D

actually pwede naman na 50volts yung working voltage ng coupling caps, pm nyo sa Danny, merong mga WIMA caps sya....
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Philippine Electronics Forum

Re: First Watt B1 Buffer Preamp
« Reply #19 on: May 03, 2012, 07:18:20 PM »
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