Solid state relay circuit diagram.
A great point of a circuit like this, is the seperation of the DC and AC voltages, so this circuit might be applied in many kind of applications, up to around 1.5 KiloWatt, in case you mount the Triac on a huge cooling-rib.The ‘M’ indicator noted on the Triac means it’s a 600volt design, a ‘D’ stands for 400volt. So be sure you go for the M model.(Tony: The NTE replacements for this circuit are 600volt models which is more than sufficient for our 110/115VAC.) Also, when you make a decision to make a PCB for this circuit, to design sufficient space between the AC lines and do not make these AC tracks far too narrow.
This schematic diagram come from circuit: Solid State Relay
Go to that page to read the explanation about above circuit design.
In the electrical sector, a schematic diagram is usually used to describe the design or model of equipment. Schematic diagrams are usually utilized for the maintenance and repair of electronic and electromechanical devices / units. Original schematics were made by hand, using standardized templates or pre-printed adhesive symbols, but nowadays Electrical CAD computer software is often used.
In electronic design automation, until the 1980s schematics were virtually the only formal representation for circuits. More lately, using the progress of computer system technology, other representations were introduced and specialized computer languages were developed, because with the explosive development of the complexity of electronic circuits, classic schematics are getting less practical. As an example, hardware description languages are indispensable for contemporary digital circuit design.