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Electronics Lab - Community - www.electronics-lab.com | Site profile
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Posting activity table on Electronics Lab - Community:
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Electronics Lab - Community posting activity graph:
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Top authors on Electronics Lab - Community during last week:
user's latest post:
How does a decoupling capacitor...
Published (2009-11-29 22:34:00)
In order for a smoothing capacitor to be of any use there needs to be a diode placed before it to prevent it from discharging back into the power supply. In a typical transformer powered linear power supply a bridge rectifier after the transformer which fulfils the function of a diode. Without a diode, the smoothing function is determined by the impedance of the power supply and the value of the capacitor.
user's latest post:
Piezo Output Device to Speaker...
Published (2009-11-29 17:18:00)
An old metronome had a hammer hit a resonant block of wood. It would be possible to make a "bongo drums" circuit that would produce a resonant sound similar to the resonant block of wood. Maybe just a good lowpass filter would smooth the "click" of the original circuit into a "knock" sound.
user's latest post:
50V, 50A H-Bridge IC needed
Published (2009-11-27 15:51:00)
Wow, you made that diagram just for me! Thanks! I have a few more questions Will I need to change those resistor values if the supply voltage drops to 25V ? Just to confirm: The high site MOSFETs are ordinatry P-Type, and the low side ones are logic level N-Type ? They must not have reverse diodes built in? Can I use IGBT's instead of MOSFET's?
user's latest post:
I need some help - My first...
Published (2009-11-26 19:00:00)
You are spot on with the 100 vs 200 HP, it is amazing to watch the requirements as speed increases. To go 150 MPH in a normal car, you can do it with as little as 200 HP. To go 200 in the same car you need almost 600 HP. There is a VERY steep logarithmic curve in getting from 100 - 400 mph. Aero plays a giant role, but it will only get you so far. As for turning, we run a straight 5 mile long course, no turns during the run. You line the car...
user's latest post:
Christmas Light Problem
Published (2009-11-23 01:31:00)
Well, the diode didn't work out so well. The lights were just as bright and, as Hero mentioned, they did have a bit of a flicker to them. I got a package of diodes from my local Radio Shack (276-1653) which included a 1N4007. I can live with the flicker, unless it means the bulbs will die sooner than expected. Would more than 1 diode in series be any better? Thanks! ~Dave
user's latest post:
How does a decoupling capacitor...
Published (2009-11-29 18:24:00)
So, firstly: Q = C V charge across plates = capacitance x voltage In a DC circuit: For momentary dips in the supply voltage, say for a moment from 5v to 3v, the back voltage from the decoupling capacitor exceeds the supply voltage, therefore to maintain electrical balance it decreases its charge across the plates in order to decrease the voltage (voltage = charge across plates / capacitance) to match the supply voltage. The difference between...
user's latest post:
60W Guitar Amplifier
Published (2009-11-29 08:50:00)
Thanks a lot guys. Would this work for the project? http://jaycar.com.au/productView.asp?ID=MT2114&CATID=19&form=CAT&SUBCATID=539 Sorry, I'm no good with transformers
user's latest post:
how can i reduce current of 1A...
Published (2009-11-29 22:34:00)
if i put a series resistor...the resistor will be damaged due to the exceeded power dissipation i guess, correct me if im wrong plz. any way this is the circuit im using: thank you
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Top 10 active forums on Electronics Lab - Community during last week:
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Top 10 forums on Electronics Lab - Community:
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Latest active threads on Electronics Lab - Community:
Started 3 months, 1 week ago (2009-08-26 00:17:00)
by PicMaster
Thanks Red wire, I did look for this the other might and wondered what happened to it, Does anyboady have the version for the OPA445 op-amp they have come back in stock at RS and ordered 10 of them so that I can continue with my version. Not sure if the above will work the same ? Thanks
Started 1 day, 15 hours ago (2009-11-29 22:34:00)
by Hero999
In order for a smoothing capacitor to be of any use there needs to be a diode placed before it to prevent it from discharging back into the power supply. In a typical transformer powered linear power supply a bridge rectifier after the transformer which fulfils the function of a diode. Without a diode, the smoothing function is determined by the impedance of the power supply and the ...
Started 1 day, 12 hours ago (2009-11-30 01:19:00)
by Alex Tsekenis
Hello, This is a very interesting project. I would be very happy to help you through this. Could you provide some further insight into how this project came about? Is this for testing of relays at a professional level or for hobby use? The idea is to understand your background to give better suggestions. Regards, Alex
Started 1 day, 20 hours ago (2009-11-29 17:12:00)
by audioguru
Most circuits draw only as much current as they need. An LED must have a current-limiting circuit or series resistor (not a parallel resistor). Attach your IR TX & RX circuits for us to see if they will try to draw more than 50mA.
Started 1 day, 20 hours ago (2009-11-29 17:18:00)
by audioguru
An old metronome had a hammer hit a resonant block of wood. It would be possible to make a "bongo drums" circuit that would produce a resonant sound similar to the resonant block of wood. Maybe just a good lowpass filter would smooth the "click" of the original circuit into a "knock" sound.
Started 1 day, 20 hours ago (2009-11-29 16:51:00)
by Killeavy
Hi there Could you provide me with more details as to what the project is for i.e. a real rail network or simulation? What type of relays does the interlocking use and would you be looking to perform commands to the interlocking or purely operate off indications, Cheers Killeavy
Started 2 days ago (2009-11-29 13:02:00)
by Hero999
No single device can do all of that: you need a different sensor for each of those measurements.
Started 2 days, 9 hours ago (2009-11-29 03:44:00)
by audioguru
This site messes-up Greek letters. This circuit is from Red Circuits so go to that site to see the correct value of the capacitors. The transformer is clearly shown as 48VAC to 50VAC. When it is rectified it makes 60VDC. Its power rating is 75VA for 40W into 8 ohms and 150VA for 60W into 4 ohms.
Started 2 days, 20 hours ago (2009-11-28 16:43:00)
by audioguru
Quote from: dexter-x on November 28, 2009, 03:25:38 PM Hey guys tell me what u think of this site ( http://www.project-world.co.cc ) I found it when looking for schematics and really like it. Anyone know any better sites? anyone like this site? It has copies of the amplifiers from Red Circuits and even has the defective 12VDC to 120VAC inverter that is from Aaron Cake's site ...
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Hot threads for last week on Electronics Lab - Community:
Started 3 months, 1 week ago (2009-08-26 00:17:00)
by PicMaster
Thanks Red wire, I did look for this the other might and wondered what happened to it, Does anyboady have the version for the OPA445 op-amp they have come back in stock at RS and ordered 10 of them so that I can continue with my version. Not sure if the above will work the same ? Thanks
Started 2 days, 20 hours ago (2009-11-28 16:43:00)
by audioguru
Quote from: dexter-x on November 28, 2009, 03:25:38 PM Hey guys tell me what u think of this site ( http://www.project-world.co.cc ) I found it when looking for schematics and really like it. Anyone know any better sites? anyone like this site? It has copies of the amplifiers from Red Circuits and even has the defective 12VDC to 120VAC inverter that is from Aaron Cake's site ...
Started 1 week, 1 day ago (2009-11-22 14:02:00)
by Hero999
Yes, you need to add a resistor or replace all the bulbs with 8V ones. If you want to use a resistor, you need to know the power/current consumption of the bulbs. The resistor also needs to have a high enough power rating and will probably need a large heat sink. Another option is to power the lights from a 50V transformer.
Started 5 days, 13 hours ago (2009-11-26 00:18:00)
by Hero999
50V@30A. I think you'll need to build the h-bridge from scratch from MOSFETs. How fast does it need to switch?
Started 6 days, 19 hours ago (2009-11-24 18:30:00)
by Hero999
I don't see why you need to do this, the front and rear wheels should be rotating at the same speed. Surely there are better ways to eliminate wheel spin: traction control four wheel drive?
Started 2 days, 9 hours ago (2009-11-29 03:44:00)
by audioguru
This site messes-up Greek letters. This circuit is from Red Circuits so go to that site to see the correct value of the capacitors. The transformer is clearly shown as 48VAC to 50VAC. When it is rectified it makes 60VDC. Its power rating is 75VA for 40W into 8 ohms and 150VA for 60W into 4 ohms.
Started 1 day, 12 hours ago (2009-11-30 01:19:00)
by Alex Tsekenis
Hello, This is a very interesting project. I would be very happy to help you through this. Could you provide some further insight into how this project came about? Is this for testing of relays at a professional level or for hobby use? The idea is to understand your background to give better suggestions. Regards, Alex
Started 1 day, 20 hours ago (2009-11-29 17:12:00)
by audioguru
Most circuits draw only as much current as they need. An LED must have a current-limiting circuit or series resistor (not a parallel resistor). Attach your IR TX & RX circuits for us to see if they will try to draw more than 50mA.
Started 3 months ago (2009-08-31 00:39:00)
by Hero999
http://www.silicontronics.com/index.php?action=ezp ortal;sa=page;p=15
Started 1 week ago (2009-11-23 17:52:00)
by audioguru
The translation is horrible, isn't it? The transistor is not available at the two largest electronic parts distributors in the USA so I think the circuit is very old and the transistor is not made any more. The amplifier has a gain of only 5dB so it needs an input of about 15W to produce an output of 50W. It is illegal to be your own radio station unless you live on Mars.
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