Hi Daniel,

An adjustable voltage regulator like the LM317 can be configured for current
or voltage regulation. The LM317 wastes 'up to' 3 volts each and outputs 1.5
amps. The LM1086 wastes up to 1.3 volts and will deliver 1.5 amps, the
LM1084 will deliver 5 amps. You can configuring one as a current limiter and
a second as a voltage regulator to get what you want.

You will also need a rectifier (bridge, half or full wave), a couple
capacitors and maybe a choke to get the DC to start with..

NOTE: Nothing is 100% efficient. Every component wastes some current and
voltage. You will not get 'the maximum of the transformer'.

Jay


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"daniel" wrote in message
...
is there a way of making a variable current supply with an output anywhere
form 0.1A to the maximum of the transformer but using a fixed voltage e.g
12V.

thanks