At any rate, using 42 V and 100k ohms, we can calculate the current at the base should be about 0.42 milliamps. I think this is due to the motor and 120 ♟ capacitor, but not sure. In practice I've actually seen the voltage be 42 V. Note that after the diode, in theory, the voltage is actually \$24\sqrt\$. The two datasheets I've found for the 2n2222a transistor ( one, two) do not have specific information regarding the maximum voltage or current allowed on the base of the transistor. I've come up with the following solution, but am having trouble deciding if it's safe to run the 24 V directly into the base of the transistor or not. Using a Raspberry Pi, I'm trying to detect when the limit switch has been triggered. Do "run" and then "plot -vout vin".I have a 24 vac motor that is partially controlled by a limit switch, which shuts down the motor when the payload has reached its maximum distance. Uses 1k for input resistor, and 10k for feedback, so gain of -10.
Here is inverting opamp amplifier and frequency response. * Use realistic square wave with rise time/ fall time 50n Should get graph showing large negative current spikes indicating backwards current flow in diode as shown below in graph of simulation. Use this netlist as source, then "run", then "plot vout vin". Here is a diode circuit for investigating the reverse recovery time. *vvvvvvvv Included SPICE model from 2N3904.mod vvvvvvvv * provides advanced spice netlisting capability. Here is a spice netlist for a 2-transistor negative feedback amplifier. 2N2222A parts, chip, ic, electronic components. 2N2222A data sheet, alldatasheet, free, databook.
model 2N3904 NPN(Is=6.734f Xti=3 Eg=1.11 Vaf=74.03 Bf=416.4 Ne=1.259 Datasheet search engine for Electronic Components and Semiconductors. Figure 6-8: Examples of circuits using an NPN transistor switch.
0.500W General Purpose NPN Metal Can Transistor. model 1N4148 D(Is=5.84n N=1.94 Rs=.7017 Ikf=44.17m Xti=3 Eg=1.11 Cjo=.95p transistor, for example, can easily handle collector currents of a few hundred milliamps). 2N2222A datasheet, 2N2222A pdf, 2N2222A data sheet, datasheet, data sheet, pdf, AEG-TELEFUNKEN, Silicon NPN epitaxial planar transistor for high speed switchings and RF amplifier circuits. Also google spice and go to links like this.ĭiode 1N4007 *vvvvvvvv Included SPICE model from 1N4007.mod vvvvvvvv Spice Stuff Spice Stuff: diode and transistor models netlist examples for feedback amplifier, reverse recovery time of diode, and opamp amplifierĬlick for a tutorial example and gschem with opamp.
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