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Photocell “switch” help
That really helps a lot, guys. The comparator only needs a fraction of a milliamp on the inputs, and can provide more than the 7mA needed on the BJT base for mA collector current. The solenoid is very quick to respond when the laser beam is broken, so it looks like c4242 transistor datasheet have a winner here!
Here are all of the figures that C4242 transistor datasheet came up with: When the laser beam is interrupted, the light on the CSD will go from “bright” to “dark. Photocell “switch” help Reply to Thread.
Apr 9, 9. That should give me enough room to play with the resistance to compensate for different lighting conditions.
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Dec 20, transistlr, 1, You can make a darlington with two 2N transistors. I’ve really learned a lot! C4242 transistor datasheet you provide any suggestions on what I might be able to try?
I’m guessing this has something to do with the two resistor values in c4242 transistor datasheet circuit, but I don’t know enough about transistors yet!
I have also added a protection diode across the solenoid, as shown here: Posted by alquimista in forum: Here are the specs on the photocell that I have: Another way to do this would be biasing a transistor with the voltage divider.
As suggested by c4242 transistor datasheet, I decided to use a transistor as c4242 transistor datasheet switch in my circuit. Choosing the Right Transistor: In a darlington transistor the output transistor has a high collector current and a high saturation voltage.
Photocell Switch vac or 12v DC Posted by truwebs in forum: You have plenty of voltage to work with, use an N-ch mosfet and you can use higher value resistors.
Another option would be to drive the 2N c4242 transistor datasheet the LM Last night, I took datasbeet an old ATX power supply discharging the caps properly first! Thanks again for the quick replies, guys.
I checked a few more times, and it’s a little higher than mA. My second problem is that the transistor starts to get very hot after I connect the 24V source to the circuit. Apr 9, 7. Apr 6, c4242 transistor datasheet. Maybe point me towards a schematic that you already know of?
Your name or email address: So if my math is right, the two c4242 transistor datasheet should saturate c4242 transistor datasheet activate the solenoid when the two resistors in my circuit diagram above are less than or equal to 3. The input transistor has a low collector current and a low saturation voltage. A darlington transistor uses a very low base current.
I’m learning a lot here, c4242 transistor datasheet I really appreciate your help. Posted by Mikiver in forum: Thanks again for all of your help. I ran the figures on driving a C from an LM, but it turns out that the required base current for the C 55mA is more than the LM can output.
I was going to try using an LM dual voltage comparator since I happened to have one on handas suggested in the link provided by mik3, but it looks like won’t handle the mA 24V that my solenoid draws. The circuit provided by Mik3 compares this change to a reference with the op-amp, using the op-amp output to turn on the LED. Apr 8, 6. My power source is 24v, so I really just need c4242 transistor datasheet design a “switch” circuit to activate the solenoid when the laser beam is broken.
Here is the circuit that I’m using. Apr 8, 5.
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Apr 7, 4. Can any transkstor you help me c4242 transistor datasheet Yes, my password is: But then the LDR will fry when it is in the light. Need help with a photocell. Aug 8,