KITS just about ready

AntiCrapAntiCrap
in Analogue
The power amps = 5W SECA, 15W PP B class, 30W A/B all design based on chassis from Amazon.
The complex and bit was to design a PCB that did all 3 version thus reducing R&D cost from thousands to £500/
SECA Pre being done now by Quickie.
Normal Pre ready just trying to find nice chassis 
The Amps are all leaded no SMD.
BOM and cct available on request. 
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Comments

  • cj66cj66
    edited February 23
    Muy interesante Snr. Uno-cuatro.

    I'm wondering on the 30w A/B and the SECA pre.
    Shame the SECA in only 5w as I need more power Scotty! (I currently have a 15w A class... a snadge more would be perfect).

    All through-hole, oh sweet Mary mudder of Jeesuz, thank you! Eyesight can't manage SMD anymore.
  • quickiequickie
    Nice  :)

    Whats the Normal Pre Col ? 
  • uglymusicuglymusic
    Is the Normal Pre the Headphone Amp?
  • AntiCrapAntiCrap
    uglymusic said:
    Is the Normal Pre the Headphone Amp?
    No based on the Claymore Inca Tech version BUT Leaded.

  • AntiCrapAntiCrap
    cj66 said:
    Muy interesante Snr. Uno-cuatro.

    I'm wondering on the 30w A/B and the SECA pre.
    Shame the SECA in only 5w as I need more power Scotty! (I currently have a 15w A class... a snadge more would be perfect).

    All through-hole, oh sweet Mary mudder of Jeesuz, thank you! Eyesight can't manage SMD anymore.
    Clive Meakin asked the same, so as a mono half slave it can get 16W SECA but heatsink will get to 40C at a room temp of 22C

  • uglymusicuglymusic
    AntiCrap said:
    uglymusic said:
    Is the Normal Pre the Headphone Amp?
    No based on the Claymore Inca Tech version BUT Leaded.


    Are you still planning a headphone amp?
  • AntiCrapAntiCrap
    Done it Dave, SECA Type.
  • uglymusicuglymusic
    Cool!
  • AntiCrapAntiCrap
    Bloody Loud
  • uglymusicuglymusic
    Cool!
  • AntiCrapAntiCrap
    Just completed all 4 versions of the KIT PCB.
    5W SECA sounds amazing caps 2 off 47,000uF
    SECA A/B amp caps 2 off 22,000uF 5W class A 15W class A/B gives 18W Build this one Paul I put mine in chassis you sent me THANKS
    A/B 15W Amp caps 2 off 10,000uF gives 18W
    A/B 30W Amp caps 2 off 10,000uF gives 40W
    Tested on Mintrals and Ruark Sabre, all stereo.
    When next chassis come will do bridge balance in version at 80W A/B 10W A class.

    When you come to set them up A/B bias first at 100mA and SECA at 1A.
    Also adjust DC bias to less than 1mV

    Have fun
  • uglymusicuglymusic
    Indeed! :)
  • cj66cj66
    uglymusic said:
    Indeed! :)

    Looks like Dave is building all four ;)
  • uglymusicuglymusic
    cj66 said:
    uglymusic said:
    Indeed! :)

    Looks like Dave is building all four ;)
    I have terrible burned fingers and a mountain range of melted solder.
  • cj66cj66
    edited April 19

    cj66 said:
    Muy interesante Snr. Uno-cuatro.

    I'm wondering on the 30w A/B and the SECA pre.


    Is it too soon for full details? I have new wizz-bang spectacles now :D

  • uglymusicuglymusic
    cj66 said:

    cj66 said:
    Muy interesante Snr. Uno-cuatro.

    I'm wondering on the 30w A/B and the SECA pre.


    Is it too soon for full details? I have new wizz-bang spectacles now :D

    Boom!


  • cj66cj66
    edited April 19
    Tank caps polarity reversed Dave?

    Huston, we have lift off! (There's a CJW link there)
  • AntiCrapAntiCrap
    Is this another Tesco advert Whooose???
  • uglymusicuglymusic
    cj66 said:
    Tank caps polarity reversed Dave?

    Huston, we have lift off! (There's a CJW link there)
    Who me?

    Sorry. Thought I'd replied. Ooops!
  • Marra49Marra49
    Is there more info/pictures of the SECA pre?
  • Marra49Marra49
    The case arrived last week and the pcb from Col this morning so time to have a good read and get right in my head what I need to build the headphone version for my son in law. There may be lots of questions as it has been a while since I built anything.
    First one is there a preferred manufacturer of toroids? TA.
  • cj66cj66
    I used to get mine from Toroidy in Poland, various grades and made to order.
    I was going to put the link in but the site seems to be unreachable today. Hope that's just an internettle glitch??? 
  • Marra49Marra49
    Thanks. Good trannies; used some in a build many years ago.
  • quickiequickie
    Toroidy are nice, but shipping is expensive. 

    What are you building Keith.? 
  • AntiCrapAntiCrap
    edited May 22
    Hopefully helpful info:-

    Transformer Power,    AC OUT,        DC,         PW OUT 8R,  IO 8R,    Farnell Part No,
    80VA                        12-0,12-0      16.8V          16W          2.4A       2817664
    80VA                        15-0,15-0      21.21V        27W           2.6A      1675066
    80VA                        18-0,18-0      25.45V        38W           3.1A      1675067
    120VA                      12-0,12-0       16.8V          16W           2.1A     1675070
    120VA                      15-0,15-0       21.21V        27W           2.6A     9530517
    120VA                      18-0,18-0       25.45V        38W           3.1A     2817680
    120VA                      25-0,25-0       35.00V        70W           4.3A     1675074  over limit of transformer current if both channels driven full on.

    The above is one channel only. So current demand will double.

    Capacitor a simple KISS guide 10,000uF at 1amp is 1V ripple, so 22,000uF is 0.5V ripple at 1 amp etc.

    Capacitor Value   Voltage   Recommend TX Volts     TX VA       FEC Part No   NOTE
    10,000uf                35V     12-0VAC to 18-0VAC   80 -120     2750129      A/B -27W
    10,000uf                40V     12-0VAC to 25-0VAC   80 -120     2835121      A/B  -70W
    22,000uf                25V     12-0VAC to 15-0VAC   80- 120     247571        A/B - 27W
    22,000uf                35V     12-0VAC to 18-0VAC   80- 120     2361782      A/B - 38W
    22,000uf                40V     12-0VAC to 25-0VAC   80- 120     1165580      A/B - 70W
    33,000uf                25V     12-0VAC to 15-0VAC      120        1165576       A+AB 27W
    33,000uf                25V     12-0VAC to 15-0VAC      120        1165576       A+AB 27W    
    47,000uf                25V     12-0VAC to 15-0VAC      120        1903096       A+AB 27W
    47,000uf                25V     12-0VAC to 15-0VAC       120       1903096        8W SECA

    I hope this helps sorry about spelling.

    Best Col

    PS another simple KISS quest torment  1square inch a 1W will rise 20C for heatsink a rough guide.
    The lower the ripple voltage the higher the peak power on A/B , also the higher the value of cap the peak charge current goes up so use 6A 200V diodes in bridge .
    The higher the caps the lower the ripple ideal for SECA as the CMRR is poor, i.e. it rejects hum better.
  • Marra49Marra49
    quickie said:
    Toroidy are nice, but shipping is expensive. 

    What are you building Keith.? 
    A headphone amp for my son in law.
    I have used Tiger Toroids in the past with good results. I guess I was wondering about generic ones available from Farnell etc.
  • Marra49Marra49
    Thanks Col.
  • Marra49Marra49
    I am struggling to find suppliers of the ZTX transistors except on ebay.

    Does anyone have spares or can suggest an alternative?
  • Marra49Marra49
    Apologies Col just realised you have listed Farnell part numbers.

    Bloody meds really are making me whoozy headed lol.
  • quickiequickie
    Marra49 said:
    I am struggling to find suppliers of the ZTX transistors except on ebay.

    Does anyone have spares or can suggest an alternative?
    Got mine from CPC
  • AntiCrapAntiCrap
    Ztx 651-3 & Ztx 751-3 all good
  • Marra49Marra49
    Thanks Col. 
  • Marra49Marra49
    I have found some ZTX653 and 753's. Suitable?
  • AntiCrapAntiCrap
    SBO as they say in Plessey "Spot Bottom On" well the polite vesion. 
  • Marra49Marra49
    Thanks Col. 
  • Marra49Marra49
    Hi Paul; how goes your build with the iss2 boards?

    My parts from Farnell are due to arrive on Monday.
  • quickiequickie
    edited June 9
    Nearly finished. Just got to wire in the Xformer, and a few other bits. 


    https://www.flickr.com/photos/156490168@N08/53778923772/in/dateposted-public/lightbox/


  • AntiCrapAntiCrap
    edited June 9
    Paul could you also mention in English the mod on bottom of pcb thanks .
  • quickiequickie
    edited June 9
    I can try   :) 

    AR2/AR3 change from 0r33 3w to 1.2R SMD

    Remove R1 & R2. 


    Mod underneath PCB. Link the emitters on AQ1 and AQ3 (Tip142) with a 100R 0.5W resistor to pads where R1 and R2 were removed.

    See pic 

    https://www.flickr.com/photos/156490168@N08/53779268147/in/dateposted-public/

  • AntiCrapAntiCrap
    Thank you Paul
  • Marra49Marra49
    Thanks Paul. The earth connection from the front of the board goes to chassis earth?
    I see that you have used the balanced +- connections which is confusing me.
  • quickiequickie
    edited June 10
    The connection on board is for signal, so I wouldn't tie this to mains earth. 

    If you follow the tracks on the pcb from the 10uf input caps, then these are where they connect to, though you could use the ones where the volume pot fits. 
  • Marra49Marra49
    Thank you Paul; so they do.
  • Marra49Marra49
    Do you have a link to the solder eyelets on the pcb Paul please.
  • quickiequickie
    edited June 15
    I used these :

    https://www.ebay.co.uk/itm/305507468011?itmmeta=01J0E9QQG61KYHH6D9G6PVWHMP&hash=item4721aa02eb:g:b50AAOSwcLxYJwRO&itmprp=enc:AQAJAAAA4JDres2H68x7qFmmfM3k9w9fE8C6aXEUpuSdTA9QffPUml/C/qFRriawH4oLVFtz5iOzQ5suZfUvO9sFhsjB3aFX8+mFg/cVIXDLCcvKjEwmEfh/VA8YTJ0SXbCFb/8YDlCfXLMlTaruVWq1GxXeNkV4lZgCnJuDNAVlFU/dsUR6sGLe0cO5EpgLawJd1DdXu7erGyi4VMkw9PV5Xg2L9Q0isisJr/qU8k068p7iOweTgf4Yw80ZK0Qw8HPD6rENDAqMZxLM4RZkNkOv/pKnXY5E3NQ+yGk8pnaQmWKuqLmw|tkp:Bk9SR5D43smDZA
  • Marra49Marra49
    Thanks Paul.
  • SmiffySmiffy
    quickie said:
    The connection on board is for signal, so I wouldn't tie this to mains earth. 

    If you follow the tracks on the pcb from the 10uf input caps, then these are where they connect to, though you could use the ones where the volume pot fits. 
    Paul, I'd be interested to see what your take would be on mixing up the type of Capacitor on the signal input. Do you have anything (mundorf, jensen, Audio Note etc) to try ?
    Cheers 👍
  • quickiequickie
    The 10uf polycarb caps that we use are lovely, plus being only 16v are nice and compact, so haven't felt the need to try any boutique caps. 
  • quickiequickie
    How are you getting on Keith.?
  • AntiCrapAntiCrap
    The Red Noyer 35V 20uF Bipolar are also very good.
    I have about 1000 of both type .

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