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Posts posted by mixos
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Check this project:
The 8Way Relay Board
http://www.electronics-lab.com/projects/pc/005/index.html
If you develop a new software, share it with us! -
Hi faris :D , Welcome to Electronics Lab Community!!
What exactly will be the power source? Something like this:
Dynamo Powered?
http://www.campingsurvival.com/dynflaswitba.html
Shake Flashlight
http://k3www.com/shake-flashlight.html
Faraday's Principle (the same principle with the above)
http://www.thinkgeek.com/gadgets/lights/5a9f/
Also check this conversation here:
http://www.electro-tech-online.com/viewtopic.php?t=5998&postdays=0&postorder=asc&start=0
Tell us if you find or build something else. -
Yes right FireFly :D, that's what we are trying to do with this power supply right now, to make it reliably live up to its specs !!
The transformer is good to be 4A or even 5A
Staigen recommended a high value capacitor, something like 10000uF/50V if you can find one. Otherwise you can use some connected in parallel. The sure is that a higher value than 3300uF is needed.
Rectifier bridge diodes 1N5402,3,4 are easilly overheated and for that reason a ready made bridge rectifier (at higher power rating, even 8A-10A) is proposed to be used off the board, attached to the box of the power supply for better cooling.
We waiting Staigen to make his proposals, because he is a real PSU expert!! Where are you staigen :D ? -
Billy you can freelly start a new topic: Home made etching tanks. We have to discuss many things on this.
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Then the only choise is to enable PRIVATE number from your local telephone line provider. This is a feature that most of the telephone providers offer for free or for a small charge depending the company.
I don't think there is another way to do that -
All corrections applyed to the project page:
http://www.electronics-lab.com/projects/rf/021/index.html -
Hello FireFly
You can buy a plastic insulator that is made exactly for the dimentions of TO-3 package transistor and has good heat transfer characteristics. The clear plastic you have is old type. You can also find other kind of matterials that are like rubber . Almost all electronics parts stores has it.
I attach you also an image that saws how to use it.
Regarding the "Heat Transfer Compound" you can put it both sides of the mica isulator for better performance. -
STK401 is pin compatible with the next models STK401-020 and STK401-050. The difference (with a fast view at datasheets) is the output power and max supply voltage.
Are you searching a specific info for STK401-000?
http://www.datadart.com/al/sanyo/STK401-020.pdf
http://www.datadart.com/al/sanyo/STK401-050.pdf -
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This company offers a CD catalog for free: http://www.amplicon.co.uk
Have you found any other? -
Ever wondered how a TO-3 transistor is from inside view? See below:
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Here is a simple 10 channel light bulb sequencer circuit which you can build up to decorate your house.
OPERATION
The circuit consists of 2 sections:
1) Oscillator: The oscillator is built around IC555 wired in astable mode. The frequency of this oscillator is around 1 Hz (or slightly less than that) which can be increased further by decreasing the value of potentiometer VR1. The oscillator frequency determines the speed of effect. Higher the frequency, higher will be the effect speed.
2) Sequencer circuit: The sequential lighting of bulbs is achieved using Jhonson Counter IC 4017 which has 10 decoded outputs. The output of 4017 increments by one on rising edge of each clock pulse from IC555. In the circuit the fifth output Q4 of 4017 is connected to its reset pin to reset the sequence after every four clock pulses. Here only four channels are shown but it can be extended upto 10 channels using all the outputs of 4017. In this case the reset need to be connected to Ground. For channels less than 10 the output one greater than required number of channels should be connected to reset pin to reset the cycle as soon as counter counts one greater than the required channels.
The output of 4017 drives the base of NPN transistors (BC547) through 1k resistors. The LED in the collector loop of each transistor indicates the active channel. The emitter current of each transistor further drives the gate of Triacs (BT139) thereby turning them ON and supplying power to the lamp loads. Those who have 120V AC mains in their countries can also use this circuit without any changes. Many number of bulbs can be connected in parallel on each channel provided the maximum load on each channel does not exceed 3500W for 220V operation and 1760W for 110V operation.
NOTE: DO NOT TOUCH ANY COMPONENT OF THE CIRCUIT WHEN IT IS ACTIVE AS IT MAY BE AT A VERY HIGH POTENTIAL AND MAY PROVE FATAL. I DO NOT GIVE GURANTEE OF ANY KIND. EXPERIMENT AT YOUR OWN RISK.
Author: kinjalgp -
Check here:
http://www.dannell.net/Merchant2/merchant.mv?Screen=PROD&Store_Code=DE&Product_Code=121104
http://www.donberg.ie/descript/1/14745mhz.htm -
What exactly you want:
1) your phone number not to send to the person you call
or
2) to block the incoming number (for displaying at the CallerID) that calls you? -
Take a look here:
USB to EIDE Converter
http://www.electronics-lab.com/forum/index.php?board=13;action=display;threadid=155;start=msg479#msg479 -
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Sure we would like to know how you went with this project :D
Can you please make the corrections on schematic and post it here? I would be really greatfull if you could do this.. -
just ordered 30 pcs of chips from TI..and I received it within 5 working days via UPS..and yet I request another 80 pcs.! of their products and they shipped them all promtly!! .
In fact I just received a call from UPS telling me that my package has just arrived!!
Kasamiko, can you tell as what chips you ordered? -
Have you seen this?
http://www.electronics-lab.com/forum/index.php?board=12;action=display;threadid=182 -
The following circuit is an example how to get power from RS-232 serial port. It gives regulated +5V power for logic circuits and also unregulated positive and negative power supplies for RS-232 transmitting circuit. The circuit gives only few milliampres power output because the power available from serial port is limited (and resistors R1, R2 and R3 limit current more).
more info can be found here: http://www.hut.fi/Misc/Electronics/circuits/rspower.html
or here: http://www.designnotes.com/CIRCUITS/compser1.htm -
Take a look at the project I attach you:
Wireless Liquid Level Sensing for Restaurant Applications
It measures capacitance to determinate the liquid level of a glass and send the results wireless on a base station. It's quite interesting and i think you can take much ideas on how to convert it to fit your needs.
Hope this turn you to the right direciton. -
D965 seems to be equal to :
2SC3279
2SD965
2SD879
The manufacture is: http://www.wingshing.com/en/
maybe the rest has the same name 2SDxx.. give a search with the above name.. and post results.. -
HAMEG send me the German manual which i upload here if anyone else need it:
Hameg HM205-2 manual in german
I am still searching the English
Led display Digital Voltmeter question
in Projects Q/A
Posted
Hello Gusk4x4
If you use the PCB, this voltmeter will work very nice. There are some errors at the schem and maestrodamuz has poster here the corrections along with some modifications to measure AC exept from DC voltages:
http://www.electronics-lab.com/forum/index.php?board=4;action=display;threadid=353&start=0
Hope this clarify things