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Transistor Circuit Templates This presentation is partially animated. Click within the blue frame to access the control panel. Only use the control panel (at the bottom of screen) to review what you have seen. When using your mouse, make sure you click only when it is within the blue frame that surrounds each slide. AInc. NPN transistor circuit template 0 current meter + 0 p pn junction anode n volt meter This diode is forward biased 1 pn junction cathode collector current meter base 0 + emitter n 2 pn junctions + 0 p current meter + n 0 pn junctions + 0 + volt meter volt meter This transistor is in conduction NPN transistor circuit template When v d gets high enough, the light will turn on. If v gets higher, the light will become brighter. d Voltage here, v , d goes up as the variable resistance value goes up. resistance knob is varies turned as so resistor light moregoes so knob is on. light gets turned. brighter. input signal If the input signal and the output signal are “grounded” at the same potential the circuit is know as a common-emitter circuit. output signal + n + p n pn junctions + emitter 0 volt meter This transistor is connected in a common-emitter circuit + NPN transistor circuit template When v d gets high enough, the light will turn on. v 1 =[ R R 1 1 + R v ]vt R v d = v t v - Voltage here, v , d goes up as the variable resistance value goes up. 1 v 0 1 v Variable Resistor + - n input signal R R output signal p 2 n E Many sensors are designed to provide a variable resistance output signal. This transistor is connected in a common-emitter circuit volt meter t NPN transistor circuit template At high voltage value, light is ON. high value v in Low value v 0 At low voltage value, light is OFF. output signal time R the voltage across these two terminals - n input signal = v in + p 1 n E This transistor is connected in a common-emitter circuit Example of a digital circuit - a buffer volt meter t NPN transistor circuit template At high voltage value, light is OFF. high value v in Low value v 0 At low voltage value, light is ON. + time - n p R the voltage is applied across these two terminals v 1 n in E This transistor is connected in a common-emitter circuit Example of a digital circuit - an inverter volt meter t NPN transistor circuit template high voltage value high value v v 0 in Low value + low voltage value time - n p R the voltage is applied across these two terminals v 1 n in E This transistor is connected in a common-emitter circuit Example of a digital circuit - Flip-flop Output volt meter t NPN transistor circuit template high value v high voltage value v 0 in + low voltage value Low value time - n p R the voltage is applied across these two terminals v 1 n in E This transistor is connected in a common-emitter circuit Example of a digital circuit - Flip-flop Output volt meter t NPN transistor circuit template This light get brighter as input signal is linearly increased. There is a voltage at the orange node because of the voltage divider circuit element highlighted in blue. v 0 + v d= v -[ t R R 3 + 2 R 3 R ]vt 3 R v v 1 in This input signal is varied linearly to brighten/dim the lights. d transistor is just barely conducting. R 2 volt meter - n Voltage divider output set so t p n E This light get dimmer as input signal is linearly increased. This transistor is connected in a common-emitter circuit Example of a linear output circuit NPN transistor circuit template to the FCE power circuit current meter Reference voltage + V often not used. V 0 ref V current meter + 0 V ref + n R sensor n R p pull up v R sensor be p n E Template for monitor circuit Output circuit to monitor resistive sensor R Pull up v be n E Template for FCE circuit Output circuit to activate relay NPN transistor circuit template single pole to the FCE power circuit single throw V Single pole single throw contact set V + ref + n R sensor p R Pull up v be n E Template for FCE circuit Output circuit to activate relay NPN transistor circuit template motor running FCE motor FCE power supply Sensor is now presenting a high resistance to the transistor base circuit. V ref V + + U-Betch-um R sensor Pressure sensor Our guarantee is guaranteed Vbe is low, transistor is OFF v be R n p Pull up n E pressure circuit for PSH to activate relay NPN transistor circuit template motor not running FCE motor FCE power supply V ref V + + R sensor Vbe is low, high, transistor is OFF v ON be R pressure goes up n no current is flowing inemitter-collector emitter-collector in circuit circuit p Pull up n E End of Presentation AInc. N.O. push button 0 current meter