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Thread: The Bug is back

  1. #131
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 41,306
    I'm Geoff.

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    Quote Originally Posted by sq225917 View Post
    Foot on kill switch, 30rpm, what could possibly go wrong...
    Yeah. Wear a tie too, why not?
    "when common sense, logic and plausibility are excluded. All that remain are foolishness and lies"

  2. #132
    Join Date: Mar 2017

    Location: Liverpool

    Posts: 401
    I'm Sandro.

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    Only thing that one should wear when working on a late is underpants and or Brasserie all rest is optional extra

    Note Underpants or Brasserie will exclude one or the other unless you are like one Fitter I use to know that went on holiday to Brasill and came back whit a pair of bubbies
    Do we need to be politically correct one the Brexit is over ?

    Any way Martin and I decided not to post more about the BOX
    I have been working on the finishing touches

    This is the temperature controller

    DSCF2425.jpgDSCF2431.jpgDSCF2432.jpg
    Temperature controller
    Prerequisite:
    The amplifier must reach working temperature quickly
    When the temperature is reached 2 cooling fans turn on andkeep the temperature at a set value
    Component used are when possible are the same as used troughout on other part of the amplifier
    Bling whenever possible 😊
    How it works
    From the positive supply rail, a Mossfet switches on and supplya variable voltage to the fans
    The speed of the fans is controlled by 2 thermistors placedon the heat sink
    As the temperature increase the thermistor resistance dropthose are in series whit a variable resistor VR 1 that set a voltage that throughthe gate resistor eventually turn on the Mossfet as the voltage increase
    Around 3 volts are required by the Mossfet to startconducting
    As the Mossfet output voltage is low the 2 fansí1s ,2 X 12volts units will stall also as the amplifier must reach a working temperature quicklythe supply to the Mossfet is switched on and off
    The operation of the relay will also switch on 2 Led oneindicating low temperature the other cooking temperature
    The relay part of the circuit is the same as the one used onthe speaker protection board
    The point at which the relay turns on is set by Vr 2
    A third Led switches on if the temperature ever goes to hiand is set by Vr3
    Led 4 is the Speaker protection Led and is on this sameboard
    The board control circuit is supply by a 7812-voltageregulator as 12 volts are required by the Vu meter boards that I will notdiscuss at present
    Q1 Q3 KSC945 Q2 MPSA06
    R1 1K R2 100K
    Vr1 100 K thermistors 4.7K
    RL 1 12 V relay
    Vr2 Vr3 and all other to be assessed

  3. #133
    Join Date: Mar 2017

    Location: Liverpool

    Posts: 401
    I'm Sandro.

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    Sorry for crappy photos + copy and paste make same words stick togheterer

    Comments especialy as resistor values are most velcome as I am building a couple of protos (see circuit boards) to start whit

  4. #134
    Join Date: Mar 2017

    Location: Liverpool

    Posts: 401
    I'm Sandro.

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    DSCF2434.jpgDSCF2433.jpg

    Fan controller now completed
    I had to change the previous design as the relay was chattering a bit

  5. #135
    Join Date: Mar 2017

    Location: Liverpool

    Posts: 401
    I'm Sandro.

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    DSCF2433.jpg

    Another view of the fan controller board (Silver plated of course)


    DSCF2435.jpg

    One off the 4 VU meter Bling

    DSCF2440.jpg

    All drilling is done now is time for assembly


    DSCF2441.jpgDSCF2443.jpg

  6. #136
    Join Date: Mar 2017

    Location: Liverpool

    Posts: 401
    I'm Sandro.

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    F5TV3.jpg

    Sorrrrrrrrrrrrrrrrrrrry could not resist

  7. #137
    Join Date: Mar 2017

    Location: Liverpool

    Posts: 401
    I'm Sandro.


  8. #138
    Join Date: Mar 2017

    Location: Liverpool

    Posts: 401
    I'm Sandro.

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    First listen happen last week
    DSCF2455.jpg

    Left channel finished there is same minor work to do left

    DSCF2456.jpg

    right channel is going back on bench today to get boxed in
    DSCF2454.jpg

  9. #139
    Join Date: Aug 2018

    Location: Liverpool

    Posts: 13
    I'm Martin.


  10. #140
    Alex_UK's Avatar
    Alex_UK is offline Spotify + Facebook Moderator / Chilled-Out Wino and only here for the shilling
    Join Date: Aug 2009

    Location: Sunny Suffolk, UK

    Posts: 14,241
    I'm WrappingALilacCurtainAroundMyBobby.

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    Wow, they look amazing!
    Alex

    Main System: Digital: HP Laptop/M2Tech Hiface/Logitech Media Server/FLAC; Marantz SA7001 KI Signature SACD Player and other digital stuff into Gatorised Beresford Caiman DAC Vinyl: Garrard 401/SME 3009 SII Improved/Sumiko HS/Nagaoka MP-30
    Amplifier: Rega Brio R. Speakers: Spendor SP1. Cables: Various, mainly Mark Grant.
    Please see "about me" for the rest of my cr@p! Gallery


    A.o.S. on Facebook - A.o.S. on Spotify - A.o.S. on Twitter

    There is only one way to avoid criticism: do nothing, say nothing and be nothing Aristotle

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