Hi,
Here is a fan control circuit used in Yorkville's amplifiers, AP3400 and AP6040. The Darlington MJH11018 is obsolete but you can use MJH11022 which is still manufactured by ON Semiconductor. Some minor component recalculations needs to be done in order to work with you power supply. Of course, MJH11022 needs to be mounted on a heatsink. If you wanna complete schematic, give me the details via PM.
Edit: Here is the link for AP3400 service manual.
http://www.yorkville.com/downloads/other/smap3400.pdf
Here is a fan control circuit used in Yorkville's amplifiers, AP3400 and AP6040. The Darlington MJH11018 is obsolete but you can use MJH11022 which is still manufactured by ON Semiconductor. Some minor component recalculations needs to be done in order to work with you power supply. Of course, MJH11022 needs to be mounted on a heatsink. If you wanna complete schematic, give me the details via PM.
Edit: Here is the link for AP3400 service manual.
http://www.yorkville.com/downloads/other/smap3400.pdf
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You could investigate using a "wattless" dropper where a capacitor is used in place of a resistor.
Rectify the supply and scale the cap/s to give around 12 volt or aim a little higher and use a simple reg.
You would have to elaborate on it but this is the idea,
UK Vintage Radio Repair and Restoration - Dropper Calculations
Rectify the supply and scale the cap/s to give around 12 volt or aim a little higher and use a simple reg.
You would have to elaborate on it but this is the idea,
UK Vintage Radio Repair and Restoration - Dropper Calculations
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