I have acquired a 90s speed converter designed for the kind of AC motor used in a Linn TT - it adjusts speed by changing the frequency of the mains supply.
It consists of a PCB with half a dozen chips on it and 2 power transformers (and some caps!):
* the first transformer is 240/15v, feeding a rectifier to provide a DC rail for the chips, while
* the second is 240/12v, situated at the end of the circuit and is connected in reverse. IE. the secondaries are attached to the PCB and the primary winding feeds 240v power to the power socket on the back of the case (which the TT power lead, plugs into). The PS for the TT is the original, basic Linn PS consisting of a 10K resistor to drop the voltage getting to the motor and a 0.22uF X2-rated mains cap, to provide a phase difference.
My question is ... is it OK to "reverse" a power transformer in this way ... or is it better to use a transformer which has been specifically designed to have a primary of 12v and a secondary of 240v?
Any input greatly appreciated. :)
Andy
It consists of a PCB with half a dozen chips on it and 2 power transformers (and some caps!):
* the first transformer is 240/15v, feeding a rectifier to provide a DC rail for the chips, while
* the second is 240/12v, situated at the end of the circuit and is connected in reverse. IE. the secondaries are attached to the PCB and the primary winding feeds 240v power to the power socket on the back of the case (which the TT power lead, plugs into). The PS for the TT is the original, basic Linn PS consisting of a 10K resistor to drop the voltage getting to the motor and a 0.22uF X2-rated mains cap, to provide a phase difference.
My question is ... is it OK to "reverse" a power transformer in this way ... or is it better to use a transformer which has been specifically designed to have a primary of 12v and a secondary of 240v?
Any input greatly appreciated. :)
Andy