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Hi Edaboard
I have four components on a PCB controlling a Pneumatic valve
Two of them have text according the picture
The other too look the same but with the text (my interpretation)
Top row: SU4 or S U4
Mid row: 355
Bot row: Same except letter C
Best regards
Peter
Hi!
I have a FLUKE 85 III True RMS Multimeter. With the following DCV specification
"Accuracy ... ± ([% of reading] + [number of least significant digits])
For model 87 in the 4½-digit mode, multiply the number of least significant digits (counts) by 10."
"Display: Digital: 4000 counts...
Hi!
I have the following problem
"The figure a) shows the circuit symbol of a device known as the p-channel junction field-effect transistor (JFET). As indicated, the JFET has three terminals. When the gate terminal G is connected to the source terminal S, the two-terminal device shown in b) is...
Evening!
I'm looking at an example (see figure 1).
They want to know an expression of Rin.
Solution:
"From the figure we see that the voltage vΠ will be equal to -ve. Thus looking between E and ground we see a resistance rΠ in parallel with a current source drawing a current gmve away from...
Ahh okay, but how do I incorporate that into the Ve-equation? I've been looking around at different methods (DC network analysis methods) but I can't get anyone to work. Could you point me in the right direction?
Hello!
Another question regarding a problem in Microelectronic circuits 5th ed by Sedra Smith (exercise 1.20)
Please see the attached image. Everything except the green arrow and label is in the original figure
Problem:
Find the input resistance between terminals B and G in the circuit shown...
Thank you for the answer, two questions.
1. Do you use the fact that Avo = "Open-circuit voltage gain" so RL is assumed infinity i.e. Avo = Av = 100 V/V (or 40dB)?
2. Can you explain why my answer to question #2 is incorrect?
Power gain = Pout / Pin
Pout = Vout^2 / RL
Pin = Vin^2 / Ri
same...
Hi!
I'm doing some exercises in Microelectronic Circuits (Sedra Smith 5th ed) and got stuck on 1.13 (voltage amplifiers)
NOTE! This is not the end-chapter excercises included in the PDF solution manual!
According to SedraSmith a voltage amplifier can be modeled as in the figure.
The...
Hey again!
Don't mind post #3 I now know the answer to most of my questions. Except one..
You wrote that in case of the BJT in a common collector circuit I could skip the freewheeling diode.
When I google relay + bjt 99% of the circuits i find are common-emitter (got that right?). But if you...
So the BJT does not need a freewheeling diode? Or do both BJT and MOSFET need a freewheling diode?
What is the purpose of the base series resistor?
I'll look up thet common collector circuit
Thanks FvM
Hi EDA!
I want to switch a relay with my uC. What options do I have? I'm new to transistors (and electronics in general =])
I'm using a PIC18F4550 and the relay I want to switch is a V23026A (TE-Connectivity).
1. I guess I can use the uC directly to switch the relay since it is possible to...
Yep the max is 500mA so 300mA would not be a problem regarding the max limit.
However I did a simple test today with a switch and a 17Ohm resistor. When the resistor is not connect I measure 5.05V over the USB port. When I connect the resistor the voltage suddenly drops to 4.8 - 4.9V and stays...
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