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Old 9th January 2013, 09:48 PM   #641
sharpi31 is offline sharpi31  United Kingdom
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B1 builders thread
In my experience a semi decent external smps, ferrites on the dc lead to the B1 and a CRCRC filter is perfectly good enough for a B1. Having said that I've not built the B1 variant with symmetrical supply and high quality regs described elsewhere in this forum, so can't comment on the level of gains that approach can offer.

The nice things about the external psu are:

Cheap and easy to build
No 50/100Hz mains hum issues (no linear supply within the B1 chassis with associated fields)
Easy to try different psus (linear/smps, different voltages etc)

If you have an existing psu that could do the job (old laptop charger etc) my recommendation would be to bash on with building the B1 as I'm sure you'll be very happy with the results. Once it's up and running you can play around with alternate supplies to your hearts content.
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Old 9th January 2013, 10:10 PM   #642
tinitus is offline tinitus  Europe
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B1 builders thread
Quote:
Originally Posted by voxxonline View Post
As I understand regulated psu is not that important in b1 and ordinary laptop psu or similar is more than enough ?
that is regulated
but no, I dont think you need regulated supply
but ofcourse its much easier to use laptop supply
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Old 9th January 2013, 10:29 PM   #643
tinitus is offline tinitus  Europe
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B1 builders thread
hey, that reminds me, tho this isnt going to be a B1, but it easily could have been
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Old 14th January 2013, 12:39 AM   #644
lausar is offline lausar  United States
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Default 8.2uf 250v Cap

Can I use this value in place of the 10uf one spec'd? I have a few SCR's already.

Thx.
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Old 14th January 2013, 05:10 AM   #645
valvesound is offline valvesound  South Africa
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lausar....Regarding the output cap. If you consider the input impedance of the amplifier you'll be using the B1 with, you can have lower output capacitance. Try keep the -3dB frequency cutoff below 1 Hz and you will be fine. I used a 4.7uF and my input is 100K to the F5 I'm using. The 100K in parallel with the 220K on the B1 output and a 4.7uF gives a -3dB point of around 0.5 Hz and there is no lack of bass what so ever.
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Old 14th January 2013, 05:31 AM   #646
bart_dood is offline bart_dood  United States
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Default Here's my B1

Stock B1, used a 24v switcher power supply with a linear section to drop the voltage to 20.5v. Checked the PSU and audio outputs with a scope and found switcher noise in both so since these pics I added a larger inductor to drop it down. Its minimal now.

Sounds great and yes I built it in an upside down Ikea baking tray (stainless steel) with a plywood wooden bottom.

Can't decide whether or not to add the Pass DIY sticker or not (or where?).

Its feeding my penultimate zen amp and is fed by a ODAC DAC and an ESP battery powered phono stage from a Rega Planar TT.

Tip my hat to Mr Pass for making this all possible..

Chris
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Old 14th January 2013, 05:36 AM   #647
voxxonline is offline voxxonline  United Kingdom
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B1 builders thread
Baking tray !
My b1 is in ferrero rocher chocolate box (temporary but still..)
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How to find time to finish my projects ?
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Old 14th January 2013, 10:54 AM   #648
merlin el mago is offline merlin el mago
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@studiostevus
Sorry for OT, I want to send you a pm but your box is full.
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Old 14th January 2013, 11:12 AM   #649
valvesound is offline valvesound  South Africa
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Quote:
Originally Posted by bart_dood View Post
Stock B1, used a 24v switcher power supply with a linear section to drop the voltage to 20.5v. Checked the PSU and audio outputs with a scope and found switcher noise in both so since these pics I added a larger inductor to drop it down. Its minimal now.

Sounds great and yes I built it in an upside down Ikea baking tray (stainless steel) with a plywood wooden bottom.

Can't decide whether or not to add the Pass DIY sticker or not (or where?).

Its feeding my penultimate zen amp and is fed by a ODAC DAC and an ESP battery powered phono stage from a Rega Planar TT.

Tip my hat to Mr Pass for making this all possible..

Chris
Looks great Chris. If I might make an improvement suggestion it would be to change the Solen fastcaps with something much much better and will not break the bank. I used Robert Hovland supercaps and must say they are really superior caps. They made the use of caps transparent in my B1 + F5 system.
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Old 23rd January 2013, 05:59 PM   #650
rokoko is offline rokoko  United States
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I am looking for a good stepped attenuator (volume control) with the least clik-clik, most smooth rotation. Is it Goldpoint or Dact better or etc., please suggestions/comments anyone.
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