Building Elvee's Circlophone: Documentation, Parts, Accessories, & beginner friendly - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 1st April 2012, 01:48 AM   #1
diyAudio Member
 
danielwritesbac's Avatar
 
Join Date: Nov 2007
Default Building Elvee's Circlophone: Documentation, Parts, Accessories, & beginner friendly

Intro
Circlophone is a new topology (a more efficient Class A, dynamic class AA), with a live sound character and an easy build. These are fun!
Schematics (login to view)
The Original, optimized Circlophone
A Single Rail Circlophone
A Mouser Parts schematic example
A wide range of voltage and power
Earlier model, of a Circlophone CFP
Piersma advanced Circlophone CFP
Terrangima Darlington and MOSFET
Piersma Inverted JFET Circlophone
Piersma Inverting JFET and MOSFET

Circuit boards
Wakibaki, regular Circlophone
Terranigma, regular Circlophone
Alex MM, regular Circlophone
Abetir, Alex, regular Circlophone
Project16, regular Circlophone
Powerflux, regular Circlophone
Abetir, regular Circlophone
Terranigma, Circlophone CFP
Piersma, adv. Circlophone CFP
Terrangima, Darlington & MOSFET
Piersma, Inv. JFET Circlophone

Click the image to open in full size.
Parts options
(and shopping links)
♦ Q9, Q11 Driver: KSA1220, 2SA1930, 2SA1837, 2SA1358, 2SA968, 2SB649, Philips BD140, Harris BD140-16, and ST's BD140.
♦ Q5, Q6 VAS (cob 4pF~16pF): 2SC5171, 2N3019, 2SC3421, 2N1893, MosFet; Or if < 5pf like 2SC2911, BF819, add this cap.
♦ Q12, Q13 Sensor: BC546B on 25+25vdc rails, With higher voltage use KSC1845, 2SC1845, 2SC2240, 2SC2705 or 2N5551.
♦ Q4, Q3 Input: A Philips/NXP BC556B (post 7) is on the original, or nicely HFE matched BC556C or BC560C with a multimeter.
♦ Q8, Q10 Output: MJE3055, BD249C, MJ802, MJL21194, MJW21196, MJ21194, MJ15022, MJ15024, MJ15003 or the classics.
♦ D4, D5: Low voltage drop and high current handling is important, like 5a, 7a (MBR735), and 10a (MBR1035) Shottky diodes.
♦ D8, D9: The sum of these two zener diodes is equal to or less than one rail (subtract sag). Or, see convenient sizing chart.
♦ D7: BAT type "Signal Schottky" like a BAT86, BAS86, BAT85 or BAT54, available at Mouser & RS. Or there is an alternative.
♦ R21: "The value in KΩ ~ = 0.9 times the total AC supply" Or review Elvee's selection guide. Or, see convenient sizing chart.
♦ R8, R11, R17, R24: You can use 1/2w resistors for enhancing quality, but it isn't mandatory, since all resistors can be 1/4w.
Build specific:
♦ VAS on Piersma's Circlophone CFP build can be Sanyo 2SC2911 or 2SC3955, or similar specs.
♦ Terrangima's Darlington & MOSFET Circlophone has its own devices listed on the schematic--See post#226.

Notes
♦ Discussion of topology and modifications: Circlophone discussion thread
♦ Various brands of 2N5551, 2N5401: Quality Control--check the HFE
♦ Various brands of 2SB649, Quality Control: Click Here
♦ If using faster output devices, click here and install C11.
♦ Other parts selection questions? Here is a link to Elvee's build notes.
♦ Checking R21, Elvee said: "Measure the voltage, divide by the resistor value, if it's 1.5mA +/-50%, it's OK"
♦ While you're measuring, it is also easy to check the idle current.
♦ Elvee's LTSpice Circlophone simulation file for the original Circophone.
♦ For an example parts list, aka BOM (Bill of Materials): Click here.

Accessories
♦ A Jfet buffer isn't mandatory but if you want one for constant input impedance, click here.
♦ To solve offset bounce versus power issues, Elvee has published an optional offset trimmer circuit.
♦ Circlophone has Class A sound but if your sound is too mellow there's compensation in the LTP soft clipper.
♦ If you have efficient speakers in combination with big gain for big dynamics, you might want a limiter to stop x-max.
♦ Circlophone has very simple power supply requirements so regulated is unnecessary, but if you wanted regulated click here.
♦ To block thumps from single rail sources (computer) power up, and block some RF too since it is slightly capacitive, look at this.
♦ Circlophones go in the house, at work AND: Boostor, a companion for a Circlophone on the move, rock the the car, RV and boat too!

Last edited by danielwritesbac; Today at 10:06 AM. Reason: Yet more Circlophones!
  Reply With Quote
Old 1st April 2012, 02:37 AM   #2
diyAudio Member
 
Join Date: Jun 2011
Great Thread!
  Reply With Quote
Old 1st April 2012, 03:17 AM   #3
diyAudio Member
 
danielwritesbac's Avatar
 
Join Date: Nov 2007
Thanks. This design is Elvee's.
I am working on documentation for his amplifier.
  Reply With Quote
Old 2nd April 2012, 07:51 AM   #4
diyAudio Member
 
terranigma's Avatar
 
Join Date: Feb 2007
Thank you for this great thread Daniel. It is best to discussing building experiments on a separate thread like this.

Last edited by terranigma; 2nd April 2012 at 08:08 AM.
  Reply With Quote
Old 3rd April 2012, 09:44 PM   #6
diyAudio Member
 
terranigma's Avatar
 
Join Date: Feb 2007
This is my latest prototype build prior finalizing CFP pcb layout. That axial metal case is a military spec tantalum capacitor used as feedback capacitor installed very casual way. You may see, TO220 schottkies have insulated with heat shrinkable tubing. This build carries BC556B/BC546B's and 2n5551's as small signal transistors, 2N5858 as bias servo, Philips BD140 as drivers, MJL21194 as power transistors.

I used a legendary Iskra 12K 1/2W resistor as feedback. Gain ratio kept as 12K/560R respecting original setting.
Attached Images
File Type: jpg circlo-proto-pcb.jpg (126.3 KB, 3403 views)

Last edited by terranigma; 3rd April 2012 at 09:50 PM.
  Reply With Quote
Old 5th April 2012, 07:01 AM   #7
diyAudio Member
 
danielwritesbac's Avatar
 
Join Date: Nov 2007
Default New Old Stock (NOS) Parts Resources versus NEW Parts resources

NOS PNP Driver (6 to 30pF)
Philips BD140 (markings "PHI BD140" gray case, circa 1988) generally unavailable
Telefunken BD140 (markings "TFK BD140") generally unavailable
2SB649 Matte finish, Curve edges, 8 sided collector plate, authentic
2SA1358 verified authentic
2SA1358

NEW PNP Driver (6 to 30pF)
KSA1220
2SA1930
2SA968
2SA1837

NOS High voltage (more than 40v rails) NPN VAS (4 to 16pF)
2SC3421 verified authentic
2SC3421
Motorola 2N3501 verified authentic
2N5858
BF819

NEW high voltage (more than 40v rails) NPN VAS (4 to 16pF)
Central Semiconductor 2N3501
Central Semiconductor 2N3500 and 2N3501
2SC5171 (probable but not yet tested)
MosFet

NEW medium voltage (for up to about 36+36vdc rails) NPN VAS (4 to 16pF)
ST 2N3019
NXP BCP56
MosFet

NOS Input
High HFE PNP Fairchild BC556C
High HFE NPN (for CFP version) Fairchild BC546C
Philips BC556B, Philips BC546B
Philips BC556B, Philips BC546B
Philips BC556B, Philips BC546B
Philips BC556B, Philips BC546B
Philips NXP BC560C, BC550C, generally unavailable

NEW Input
Fairchild BC556B, BC546B, BC560C, BC550C, KSC1845, KSA992
Toshiba, 2SA970-BL, 2SC2240-BL, 2SC2713, 2SA1163, 2SC4117, 2SA1587
NXP (Philips) BC856, BC846, BC860, BC850, (SMD versions of BC556B, BC546B etc. . .)

It may be interesting to compare specs of selections to see what they have in common, and that way you can find many more options than these. Stock of NOS parts is not guaranteed to last and likewise stock of New parts is not guaranteed to stay current. See also post 1 here. See also the main Circlophone thread where parts have been discussed and tested.
If you have selected less than 40+40VDC rails, you can fill your shopping list with authentic parts from Mouser and "just one box" may cost less.
So, if you were having shopping difficulty, or if you wanted to explore different devices, I hope this resource post helps.

Last edited by danielwritesbac; 5th April 2012 at 07:10 AM.
  Reply With Quote
Old 5th April 2012, 08:23 AM   #8
diyAudio Member
 
danielwritesbac's Avatar
 
Join Date: Nov 2007
Quote:
Originally Posted by terranigma View Post
This is my latest prototype build prior finalizing CFP pcb layout. That axial metal case is a military spec tantalum capacitor used as feedback capacitor installed very casual way. You may see, TO220 schottkies have insulated with heat shrinkable tubing. This build carries BC556B/BC546B's and 2n5551's as small signal transistors, 2N5858 as bias servo, Philips BD140 as drivers, MJL21194 as power transistors. I used a legendary Iskra 12K 1/2W resistor as feedback. Gain ratio kept as 12K/560R respecting original setting.
Click the image to open in full size.
Wow, that's compact! It looks great. Have you heard it play yet? I was wondering if it is RF resistant like your other boards?
  Reply With Quote
Old 5th April 2012, 09:28 AM   #9
forr is offline forr  France
diyAudio Member
 
forr's Avatar
 
Join Date: Dec 2004
Location: Next door
Hi,
I am very interested by the Circlophone because having nothing to preset, just like the Quad 405, and because it is a very good way to recycle old devices. It also had good specs and nice reviews.
I started to extract the necessary components for my many junk-boxes. However, I did not find any 2N3019 for the Q5-Q6 pair. Being in Tours (France) yesterday, I went to this shop
Accueil - radioson, boutique en ligne de composants electroniques pour professionnels et particuliers, installe a blere (37)
where I have been proposed BSW68A (originated form Philips, I think). Looking at the datasheets, they seem adequate for the circuit. What do you think ?
Regards.
  Reply With Quote
Old 5th April 2012, 10:03 AM   #10
Elvee is offline Elvee  Belgium
diyAudio Member
 
Elvee's Avatar
 
Join Date: Sep 2006
Quote:
Originally Posted by forr View Post
where I have been proposed BSW68A (originated form Philips, I think). Looking at the datasheets, they seem adequate for the circuit. What do you think ?
The problem is the collector capacitance: 35pF is too much for the VAS.
Note that it would probably work, but there are many suitable alternatives more common than this one, like the 2N1893 for example.
__________________
. .Circlophone your life !!!! . .
♫♪ My little cheap Circlophone© ♫♪

Last edited by Elvee; 5th April 2012 at 10:10 AM.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Building an AMP of a commecial piece but with top-notch parts Oystein Solid State 3 9th July 2009 11:22 AM
Beginner speaker building help Telemin Multi-Way 3 16th June 2009 01:23 AM
Beginner - Building a bass guitar cabinet richmoore1998 Multi-Way 3 27th December 2008 03:31 PM
Building a headphone amp from parts Smokehouse Bob Headphone Systems 13 13th August 2007 04:26 PM
speaker building (beginner) larksp Multi-Way 37 26th April 2007 04:41 PM


New To Site? Need Help?

All times are GMT. The time now is 02:33 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2