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thanks for the useful links. Those will get me going.
According to the table on the webpage of that first link, it's the same as glass. I was expecting something very close to glass but wanted to verify that.
I post my question in the Power Electronics section because, to me, this might be the most relevant section. It's about power electronics after all.
My question is rather simple. I'm looking for the specific heat capacity of most common printed circuit board materials namely FR4 and...
Hi, You can simply check this with a low power square wave generator. Set the freq. to something like 200Khz and connect it to one winding. You can now check the other windings with an oscilloscope.
I second elactis repply but also want to add the following:
-Also make sure the reset line has a pull-up resistor. (Not a joke, I've seen some people getting nuts because of a floating reset line. A floating reset line can pick up noise.)
-You should also connect a varistor across the relays...
Hi elactic, you are right about that. I-rms² R losses at low duty cycles will be high indeed. About the reproducible current: the original poster wanted to use a modulated current source for that reason. But ruling hysteresis problems like you describe, can only be done with feedback I think. If...
The only thing you might have to add are some base emitter resistors for Q1 and Q2. 10K will do. This to prevent the transistor from turning due to collector base leakage currents. The base of Q2 is floating when Q1 is on and the base of Q1 is floating when Q2 is on. Biasing into class B or...
I can only comment on the TLC271: an LM358 can also be used here. The 741 and OP07 will not work in your circuit. I don't even have to try.
2SC668, i don't know if the 2SC2053 will work.
For the other parts you mention: i don't know without digging deep into the data sheets of the...
you better start reading some basic things about op-amps. The TI app note I've posted I've posted is a good start. With dual supplies the 741 can swing to ground but not the app shown.
Hi Frank, indeed. I don't understand why people need an explanation like the one you have given. Shouldn't they be able to design a simple circuit like this all on their own? I think i will stop posting answers to questions like this. People should at least try to find out how to do things and...
-A 741 or OP07 will not work in your circuit. You can use a LM358 instead. It's inputs and output can work close to ground.
-For Q1, you can use almost any PNP transistor. A BC557 or something alike will do fine.
-The 2SC668 seems to be an RF transistor. Not sure, but an MSPH10 might work...
That wasn't clear from what you wrote.
-You can use a simple voltage source. The voltage should be set to U= R . I.
-Switching the voltage on/off with a PWM signal: use the output of your circuit to drive a mosfet.
Fig 8: 8. Power MOSFET PWM Motor Driver
Some power PWM drivers for electric DC...