{"id":8192,"date":"2020-02-17T15:34:32","date_gmt":"2020-02-17T15:34:32","guid":{"rendered":"http:\/\/www.bartola.co.uk\/valves\/?page_id=8192"},"modified":"2021-10-31T08:38:09","modified_gmt":"2021-10-31T08:38:09","slug":"cap-multiplier-pcbs-and-modules","status":"publish","type":"page","link":"https:\/\/www.bartola.co.uk\/valves\/for-sale\/cap-multiplier-pcbs-and-modules\/","title":{"rendered":"Cap Multiplier PCBs and modules"},"content":{"rendered":"\r\n

Overview<\/h2>\r\n

The circuit has been covered to death. Here is a flexible Cap Multiplier filter for HT purposes. It has the following features:<\/p>\r\n

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  1. Two modes of operations<\/li>\r\n
  2. Voltage set by classical resistor divider (lower PSR)<\/li>\r\n
  3. Voltage set by CCS and resistor (higher PSR)<\/li>\r\n
  4. Power supply noise rejection: Above 100dB<\/li>\r\n
  5. Multiple MOSFET pass device options: TO-220 and TO-247<\/li>\r\n
  6. Current limiter option at the output\u00a0<\/li>\r\n
  7. Last filtering capacitor: film type (e.g. DC Link)<\/li>\r\n
  8. HT indicator: Neon (INS-1)<\/li>\r\n
  9. Voltage range can be adjusted with a single trimpot from 0 to 450V<\/li>\r\n
  10. Slow turn on constant<\/li>\r\n
  11. ENIG Gold Finish\u00a0\"\"<\/a>Working example:<\/li>\r\n<\/ol>\r\n

    \"\"<\/a><\/p>\r\n

    Completed Boards<\/h2>\r\n

    I have a pair of completed and tested 400V variable cap multiplier boards<\/a> for supply filtering. These are ideal for a preamp or an amp. They will do 0-400V variable (with trimpot) and current limiter set to 200mA. It can be modified with single resistor and you will need a bigger heatsink for the SiC MOSFET should you want to provide more current:<\/p>\r\n\r\n

     <\/p>\r\n\r\n

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    \"\"
    Cap Multiplier PCB Rev04 – completed<\/figcaption><\/figure>\r\n\r\n<\/figure>\r\n\r\n

     <\/p>\r\n\r\n

    The boards have excellent quality Kemet electrolytic capacitors as well as a WIMA DC Link 45uF (the big red one) as the final capacitor in the audio chain.<\/p>\r\n\r\n

     <\/p>\r\n\r\n

    The plain boards are \u00a315 each. Completed boards are available for \u00a390 each until they run out. Only small batch produced of PCBs<\/p>\r\n

    Ordering PCB<\/h1>\r\n

    Please fill out the form below and I will get back to you once you confirmed quantity and shipping method (e.g. Standard or Tracked postage).\u00a0<\/p>\r\n

    Due to pandemic situation, USPS and other national post services have been a bit unreliable so I recommend tracked shipping where possible depending the value of the goods.\u00a0<\/p>\r\n

    Upon completion of payment, I will provide BOM and build guide.<\/p>\r\n

    I don’t sell kits nor parts, appreciate your understanding.\u00a0<\/p>\r\n