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Zero voltage switch temperature control – Circuit Schematic
Zero voltage switch temperature control
The ' 'zero voltage switching'' technique is widely used to modulate heating and similar types of ac loads where the time constant associated with the load (ten...
AC-static SPDT switch – Circuit Schematic
AC-static SPDT switch
An SPDT solid state relay is shown. When voltage is applied Ql will turn on, activating load #1, because the full line voltage appears across Q2, supplying gate...
Solid state stepping switch – Circuit Schematic
Solid state stepping switch
This circuit was designed to make switching of a 48-channel mobile transceiver safe to operate while mobile. The oscillators allow for single-stepping or a scan...
Triac relay-contact protection – Circuit Schematic
Triac relay-contact protection
This circuit can be used to prevent relay contact arcing for loads up to 50 amperes. There is some delay between the time a relay coil is energized and the time...
Power-switching circuit – Circuit Schematic
Power-switching circuit
This circuit provides on/off switching, soft starting, current monitoring, current tripping, and protection against overcurrent for a 30 Vdc power supply at nor...
Isolation and zero voltage switching logic – Circuit Schematic
Isolation and zero voltage switching logic
These two simple circuits provide zero voltage switching. They can be used with full wave bridges or in antiparallel to provide full wave control and are normal...
zero voltage switching – Circuit Schematic
zero voltage switching
The SCR coupler circuit provides higher sensitivity to input signals as illustrated. ...
AC relay using two photon couplers – Circuit Schematic
AC relay using two photon couplers
If load current requirements are relatively low (i.e. maximum forward rms current 500 mA), an ac solid state relay can be constructed quite simply by the connec...
Integrated solid state relay – Circuit Schematic
Integrated solid state relay
A complete zero-voltage switch solid-state relay contains an input circuit, an output circuit, and the power thyristor. The circuit illustrates a triac power th...
Three-phase switch – Circuit Schematic
Three-phase switch
To simplify the following schematics and facilitate easy understanding of the principles involved, the following schematic substitution is used (Note the triac...
Dc static switch – Circuit Schematic
Dc static switch
This circuit is a static SCR switch for use in a dc circuit. When a low power signal is applied to the gate of SCR1, this SCR is triggered and voltage is applie...
Push-on-push-off electronic switch – Circuit Schematic
Push-on-push-off electronic switch
Transistors Ql and Q2 make up the flip-flop while Q3 drives a reed relay. When power is first applied to the circuit, Ql and Q3 are conducting and Q2 is cut off...
Squib-firing circuit 2 – Circuit Schematic
Squib-firing circuit 2
The LRC input network limits the anode dv/dt to a safe value—below 30 V/jus. Rl provides critical damping to prevent voltage overshoot. While a simple RC...
Squib-firing circuit – Circuit Schematic
Squib-firing circuit
Capacitor Cl is charged to +28 V through Rl and stores energy for firing the squib. A positive pulse of 1 mA applied to the gate of SCR1 will cause it to conduc...
Photoelectric switch – Circuit Schematic
Photoelectric switch
Synchronous switching is turning on only at the instant the ac supply voltage passes through zero, and turning off only when current passes through zero. This c...
Triac zero-point switch – Circuit Schematic
Triac zero-point switch
On the initial part of the positive half cycle, the voltage is changing rapidly from zero causing a large current to flow into capacitor C2. The current through...
1 Kw flip-flop flasher circuit – Circuit Schematic
1 Kw flip-flop flasher circuit
This is an application of the static switch circuit where the control logic is a flip-flop which is controlled by the unijunction transistor. ...
Touch Switch with MPF102 JFET – Circuit Schematic
Touch Switch with MPF102 JFET
When the touch plate is contacted by a large object (human body, etc.), stray 60-?? pickup is rectified by D1 and D2, and produces a negative voltage across R2-...
Simple Relay Driver – Circuit Schematic
Simple Relay Driver
You can use that circuit to drive a relay of 12 V with a trigering signal of 5V. It uses 2 diodes 1N4002, 1 transistor 2N3904 and two resistors....
Temperature Controller with U217B
A triac controller for switching resistive loads directly from the mains supply using the zero crossing technique. The device is powered directly from the mains...