Is electric heater AC or DC?
Because electric heaters create heat by passing current through a resistive device. The resistance to electricity creates heat. Resistance doesn’t care about polarity so the voltage can be either steady DC or alternating voltage.
What is the difference between AC and DC water heater?
The AC water pump often uses copper-clad aluminum coils to achieve a competitive advantage at a low price. The DC water pump typically uses pure copper coils and more advanced motor technology to guarantee a long lifespan.
Can a vacuum tube be used for a DC heater?
Be sure to respect maximum cathod to heater voltage given by the data sheet for all your valves when you design the heater circuit. A vacuum tube device’s heater filament can be supplied with either DC or AC, the tubes work the exact same way with either type of supply: The heater is simply using the power for resistive heating.
What kind of current does a vacuum heater use?
Constant voltage (rather than constant current) is the most common vacuum tube heater drive technique. Power transformers for tube amplifiers are commonly made with 6.3-V or 12.6-V windings to drive the amplifier’s tube heaters in parallel. Powering heaters with a constant current can require an inconvenient voltage level.
What kind of DC supply do you need for a heater?
Although I designed this mostly to use as a DC supply for tube filaments or heaters, it is a general-purpose DC supply that has many applications. Basically just add a transformer to get a regulated DC voltage in the 1.25V to ~25V range, at up to 5 amps. You can connect two modules to get a bipolar supply (for opamps, for example) – see below.
Can a valve be heated with AC or DC?
In most amps, valves can be heated with AC or DC. Tapping the heaters may be important since the heater filaments can act like a diode if the cathod is some volts above heater potential (which is the case most of the time with auto bias) and induce AC hum in you beloved signal.