Quote:
Originally Posted by Richard
Re the LT, for the people wanting a range, could this not be DC and variable using a LM317 or similar type device, say 0 - 40v with an additional 40v supply you can connect in series, monitored by another cheap meter unit?....
|
This is going to need some hefty heatsinking to cover that voltage range at a high enough current to do some heaters. For example a 6080 with a 6.3V 2.5A heater would disspate over 80W in the regulator. I know this is an extreme example but it shows the potential problems. This is why multitap transformers are often seen as the best method. The alternative might be a switchmode regulator or pre-regulator.