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Old 28th March 2013, 11:50 PM   #481
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Originally Posted by massimo View Post
Oh boys! You must be very...
thick as a brick - Wiktionary
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Old 28th March 2013, 11:55 PM   #482
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Old 28th March 2013, 11:56 PM   #483
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True, and they've been saying that longer than you can imagine.
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Last edited by jacco vermeulen; 29th March 2013 at 12:01 AM.
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Old 29th March 2013, 12:17 AM   #484
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Old 29th March 2013, 06:44 AM   #485
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Originally Posted by Nelson Pass View Post
Hi JethroTull,

I really liked your first few albums, but somewhere in the middle of "Thick as
a Brick" it started to pall for me. Thanks anyway.


At my 50th birthday (sadly quite a couple of years ago) my children bestowed me a ticket to a Jethro Tull concert in my home town.

It was funny – they only played their old songs from the mid of the Sixties (“… the times when we had the Blues…”).

Near the end of the concert Ian Anderson announced “And now we are going to play a new song”. It was “My Sunday Feelings” from their 1968 debut album…
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Old 29th March 2013, 02:38 PM   #486
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And now, the Harem & Blow president of Nigeria : https://www.youtube.com/watch?v=DVUX3_NsvrE
Only gig I saw Mr Tull.

(afraid I have all of Fela albums, and none of Jethro)
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Old 29th March 2013, 04:05 PM   #487
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Originally Posted by jacco vermeulen View Post
And now, the Harem & Blow president of Nigeria : https://www.youtube.com/watch?v=DVUX3_NsvrE
Only gig I saw Mr Tull.

(afraid I have all of Fela albums, and none of Jethro)

Ian with toupee? JaJa!!
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Old 2nd April 2013, 06:15 AM   #488
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Hi Georg,

The pcbs arrived safely - nice job, very neat.

About the regulator components - some options and to see what you had in mind for the pcbs ....

Simple ones: BC 546 -> BC 548B, TL 431 -> ML431, 1n4007 -> SF14, Z12 = 12v?

Now, the 1uF - I added legs to a Wima 1uF SMD6560 and this will neatly fit

Now, the output 10uF cap - the only one I could fit is the Epcos B32522, or maybe the B32562, both Polyesters. Can "off board" larger PolyPropylines be used instead?

The thin holes for the 33uF 'lytic -> only my stock Panasonics FA series fit these holes, but smallest value is 220uF/25v, or 100uF/50v - can easily redrill holes to fit Nichicon Muse 33uF/50 volt, etc...

What did you intend for all of these and are any, or all, critical to the performance/sound

The IN, OUT, GND pads are input and seem too close fit terminal blocks and okay for the 1/4" (6mm) Faston spades, yes?

Incidently, where did you have the central 0 Volt point for the amp to be located? at the Reg GND points?

I know a few of these queries are quite trite, but it saves time if original design intentions are known.

ps: Is the 39uF/25v cap on the amp pcb intended to be a SMD Polymer cap?
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Old 2nd April 2013, 12:23 PM   #489
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Originally Posted by jameshillj View Post
Hi Georg,

The pcbs arrived safely - nice job, very neat.

About the regulator components - some options and to see what you had in mind for the pcbs ....

Simple ones: BC 546 -> BC 548B, TL 431 -> ML431, 1n4007 -> SF14, Z12 = 12v?

Now, the 1uF - I added legs to a Wima 1uF SMD6560 and this will neatly fit

Now, the output 10uF cap - the only one I could fit is the Epcos B32522, or maybe the B32562, both Polyesters. Can "off board" larger PolyPropylines be used instead?

The thin holes for the 33uF 'lytic -> only my stock Panasonics FA series fit these holes, but smallest value is 220uF/25v, or 100uF/50v - can easily redrill holes to fit Nichicon Muse 33uF/50 volt, etc...

What did you intend for all of these and are any, or all, critical to the performance/sound

The IN, OUT, GND pads are input and seem too close fit terminal blocks and okay for the 1/4" (6mm) Faston spades, yes?

Incidently, where did you have the central 0 Volt point for the amp to be located? at the Reg GND points?

I know a few of these queries are quite trite, but it saves time if original design intentions are known.

ps: Is the 39uF/25v cap on the amp pcb intended to be a SMD Polymer cap?

Hi James,

Thanks for the compliment.

The Zeners on the regulator boards should be around half the value of the desired Vout, i.e. 9.1V ... 12V. The current limiters at the MOSFET Sources ~ 6.2V.

1µ and 10µ are Epcos MKT: https://www.buerklin.com/datenblaett...D.pdf?ch=24487. Off-board devices are possible, of course, though not an elegant solution... .

100p an 150p are Wima FKP02: https://www.buerklin.com/datenblaett...D.pdf?ch=33680

.051/4W (or .047/4W) are Vitrohm KN 350-8. They form low pass filters together with the 10µ caps to prevent the circuits from HF oscillation.

The Source Rs of the MOSFETs on the amp boards are Fukushima MPC70 2W (9mm spacing).

The absolute value of the 33µ capacitors is not critical at all. Their proof voltage should be 40V minimum, however.

The 39µ/25V SMD caps are super low esr NIPPON CHEMI-CON PXA Series.

The pads are 1/4" (6.35mm) Faston spades (5mm spacing). It might be necessary to redrill the holes depending on their makers. Just solder them on both sides of the boards. The IN pads are 1.2mm solder nails.

The central 0V points are the grounding points at the capacitor banks, where all grounds meet, except of the IN GND which are directly lead from the RCA ports to the amp boards. I recommend to have a load capacitance of at least +- 44.000µ per channel before the regulator boards and the same buffer capacitances at the regulators' outputs.

Best regards,
Georg
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Old 2nd April 2013, 12:48 PM   #490
tinitus is offline tinitus  Europe
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wow...artwork

btw, those small lytic can be very 'deceptive'
I had some with a red marking
red indicated the negative terminal
mounted it wrong ofcourse
but fortunately I checked the specsheet before connecting the power
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