Such a system could not generate enough voltage to produce audible speech in distant receivers, so every transmitter since Bell's patented design has operated on a direct current supplied by an independent power source.
Suppose a direct-current supply is connected to the armature terminals such that a current enters at the positive terminal.
Dendrites growth is a result of electrochemical migration (ECM) process, which is another factor affecting soldering reliability for electronic packagings, it was carried out as a designed schematic diagram coupled with a direct current power supply.
A direct current power supply was used for the electrochemical anodization.
The anodization voltage was constant at 20 V with a direct current power supply.
The potential was controlled, and the subsequent current measured using a direct current power supply (Thurlby Thandar Instruments QPX1200SP model).
The base plasma is generated by a direct current power supply (up to 1000 V and 2.0 A).
The heating panel was fed with a direct current power supply that has 400 W total powers.
Anodization of titanium foils was carried out at room temperature using a two-electrode system (2-cm separation) with a direct current power supply.
The ITO was vacuum-deposited onto a 0.4-mm-thick sapphire substrate and connected to a direct current power supply to control the heat flux at the surface.
