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Category: Other Circuits / Switching Circuits Views: 5477 Rank: 0 This circuit will provide an indication whenever the input voltage differs from two defined limits, V1 and V2. The supply voltage, Vcc must be higher than the highest input voltage by at least 2 volts. One application here is to monitor a 12V car battery. V1 could be set to 14V and V2 to 11V thus giving an indication of over charge or a weak battery.The op-amps used here are MOSFET CA3140. They are used to advantage as they have very little output offset voltage and can switch down to near 0volts. If any other op-amp is used such as LF351 or CA741 then it will be necessary to have an offset null cont visit page. The op-amps used here are MOSFET CA3140. They are used to advantage as they have very little output offset voltage and can switch down to near 0volts. If any other op-amp is used such as LF351 or CA741 then it will be necessary to have an offset null cont http://www.zen22142.zen.co.uk/Circuits/Switching/comparator.htm
Related circuits Switches For Microwave Applications The concept of an equivalent circuit is fundamental to electrical circuit analysis. To explain briefly the meaning of this concept, lets consider the following situation Circuits A and B are connected at a pair of terminals a,b. Circuit A may be a voltage generator with its internal... Although this circuit uses a 74HC74, any CMOS variant of this flip-flop will work. IC1A acts as a true/ compleme Toggle Switch Control Of Twin Coil Switch Machines These circuits allow an ON-ON type DPDT toggle switch to control a twin coil switch machine motor. The handle of switch can then be used to indicate the route selected. The circuits are also able to control LEDs that could be used to indicate the selected route. Digital Audio Selector Circuit This circuit, uses switched emitter followers, rather than the usual analog switch CMOS chips. This yields better reduction of crosstalk between channels. A basic circuit to trigger an SCR is shown in Fig. 67 -lA. This circuit has the disadvantage that the blocking voltage of the photon-coupler output device determines the circuit-blocking voltage, irrespective of higher main SCR capability. Adding capacitor Cl to the circuit, as shown in Fig.... The alarm will switch off when the 4 keys connected to "A,B,C,D" are pushed in the right order.The circuit works because each gate `Stands` upon its predecessor.If any key other than the correct key is pushed, then gate 1 is knocked out of the stack, and the code entry fails. Pin 1 is held high... Touch Switch Using Cd4066B Circuit When touch switch SI is activated, R4 is driven high, and the control voltage goes high, which latches the switch. In this circuit a non-locking push switch is used to activate a load. The load remains switched on until power is removed from the circuit. The load is represented by R5 and D1, but could be a lamp, a relay or another circuit. S2 breaks power to the circuit but could be omitted altogether. If S2...
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In practice, the value is around 18 mV due to the resistance of the output transistor of the comparator. This means that the circuit will switch back to the lower voltage range when the input voltage drops below approximately 18 V. The amount of ...
An integrated circuit "Voltage Comparator" is equivalent to an Operational Amplifier, Such as the LM358 or LM324, with two NPN transistors added to the output of each amplifier. (Refer to the above schematic.) This arrangement produces an " Open ... The output is switched ON or OFF depending on t...
This is a design circuit diagram of a light activated switch. This circuit is based on National Semiconductors comparator IC LM 311 and a LDR for operation. This is the figure of the circuit. The circuit is based on a voltage ...
The main parts of this circuit are Sensor Circuit, Voltage Comparator, Switching Circuit, Relay Circuit and the Water Pump. The sensor will sense the water level by using reflection of light and then an indication is given to the ...
The 4th comparator is used to generate a time delay after the normally closed switch is opened. Two resistors (36K and 62K) are used as a voltage divider which applies about two-thirds of the battery voltage to the (+) ...
Its sensor must be placed in contact with the feeder to be able to monitor when the power cable is drawing current, thus causing the circuit to switch-on a LED.The circuit ... Low Power Dual Op-amp (Second version) IC1______________LM324 Low Power Quad Op-amp (Third version) L1________________10m...
Automatic irrigation motor controling with waterlevel and overheat protection...
Triangular Voltage Generator
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