Search found 21 matches

by iambrus
Thu Dec 18, 2003 4:55 am
Forum: General Discussion
Topic: Voltage divider re-united
Replies: 3
Views: 925

Re: Voltage divider re-united

OOOOOPS!!!!! 4 time 55Vs. 220/4 makes 55.
by iambrus
Thu Dec 18, 2003 4:51 am
Forum: General Discussion
Topic: Voltage divider re-united
Replies: 3
Views: 925

Voltage divider re-united

Hello there. It is only a theorycal question. Lets say I have 220V AC and I have got current feedback amplifiers only can handle up to 60Vs. A voltage divider could give me 4 times 60V not respectively to earth but to each others. I can get the amplifier gains and that I could increase voltage up to...
by iambrus
Thu Dec 18, 2003 4:40 am
Forum: General Discussion
Topic: DC to AC inverter with the 555
Replies: 2
Views: 772

Re: DC to AC inverter with the 555

Thank you David, I went through the circuit and realised that I only need to leave out R4 in order to get a fix 50Hz frequency.
by iambrus
Thu Dec 18, 2003 2:43 am
Forum: General Discussion
Topic: DC to AC inverter with the 555
Replies: 2
Views: 772

DC to AC inverter with the 555

Hello there, I found an interesting DC/AC converter design for 50HZ 220V. http://www.uoguelph.ca/~antoon/circ/555dcac.html <p>I was almost very happy until I read the description. There is R4 potmeter which is supposed to regulate frequency. Without an oscilloscope how can figure out what frequesncy...
by iambrus
Wed Dec 17, 2003 1:58 am
Forum: General Discussion
Topic: DC/AC converter 220V 50HZ
Replies: 11
Views: 2234

Re: DC/AC converter 220V 50HZ

Dear Bert, Thank you for your opinion. Unfortunately I cannot give you a technical answer and this is not a place for an emotional one. I have many other reasons not only ecological to go on with my project and I hope to help a lot of people in very difficult economical situation with it. Take care
by iambrus
Tue Dec 16, 2003 8:02 am
Forum: General Discussion
Topic: DC/AC converter 220V 50HZ
Replies: 11
Views: 2234

Re: DC/AC converter 220V 50HZ

Thank you Jolly for your message. Could you pls advice on some models that I could study and compare costs, so I can understand a bit more. Lets say I need one AC generator and a DC motor. What size, and how much power do you think I could get out of them? The "off the shelf solution" would not perm...
by iambrus
Tue Dec 16, 2003 4:50 am
Forum: General Discussion
Topic: DC/AC converter 220V 50HZ
Replies: 11
Views: 2234

Re: DC/AC converter 220V 50HZ

Forgot to mention a current sense Amplifier from MAXIM http://www.maxim-ic.com/appnotes.cfm/ap ... 1934/ln/en
It is still just theory.
by iambrus
Tue Dec 16, 2003 4:45 am
Forum: General Discussion
Topic: 12V 30Amp Power Supply Changes
Replies: 3
Views: 883

Re: 12V 30Amp Power Supply Changes

Thanks Russ it is you again. I was just curious if it would also work with AC current.
by iambrus
Tue Dec 16, 2003 4:43 am
Forum: General Discussion
Topic: DC/AC converter 220V 50HZ
Replies: 11
Views: 2234

Re: DC/AC converter 220V 50HZ

Thank you Russ, yes I am thinking to sell power back to the grid. Naturally, the power company wants to see something working before discussing anything. A true sine wave oscillator would not be useful? I am not affraid to do a bit soldering if I could find a good design. My original idea was this. ...
by iambrus
Mon Dec 15, 2003 12:03 pm
Forum: General Discussion
Topic: DC/AC converter 220V 50HZ
Replies: 11
Views: 2234

Re: DC/AC converter 220V 50HZ

Thanks Guys, Could you be a bit more specific? I spent lots of hours today on the internet trying to learn more about it. I found so many different ones. 1 phase, or 3 phases? What DC level do I have to use? Lets say 12VDC or 220VDC? or something else? Which type should I buy? How can I understand h...
by iambrus
Mon Dec 15, 2003 11:55 am
Forum: General Discussion
Topic: MOSFET, HEXFET,IGBT,ChargePump etc...
Replies: 10
Views: 1822

Re: MOSFET, HEXFET,IGBT,ChargePump etc...

Thank you Russ, Could you be a bit more spesific.
It is all new for me. Is there any small one, and how do they work?
Thanks
by iambrus
Mon Dec 15, 2003 8:46 am
Forum: General Discussion
Topic: 12V 30Amp Power Supply Changes
Replies: 3
Views: 883

Re: 12V 30Amp Power Supply Changes

UPS!!! I mean 24V AC instead of 24DC.Sorry.
by iambrus
Mon Dec 15, 2003 8:43 am
Forum: General Discussion
Topic: DC/AC converter 220V 50HZ
Replies: 11
Views: 2234

DC/AC converter 220V 50HZ

Hi there, I would like to convert 220V DC to 220V AC 50hz true sine wave. What is the best solution?
Thank you in advance
by iambrus
Mon Dec 15, 2003 8:40 am
Forum: General Discussion
Topic: 12V 30Amp Power Supply Changes
Replies: 3
Views: 883

12V 30Amp Power Supply Changes

I found this 12V power supply on the internet. It clams to supply 30Amps. My very stupid question would be this. HOW WOULD BEHAVE THIS CIRCUIT IF I REMOVED THE LM7812C REGULATOR and instead of dc 12V I would use 12AC? http://www.mitedu.freeserve.co.uk/Circuits/Power/1230psu.htm Would it only fry egg...
by iambrus
Sun Dec 14, 2003 3:32 pm
Forum: General Discussion
Topic: MOSFET, HEXFET,IGBT,ChargePump etc...
Replies: 10
Views: 1822

Re: MOSFET, HEXFET,IGBT,ChargePump etc...

Dear Richard, after reading your message I am chilled and I must say that I am almost ready to reconsider my little project and go on with it. It is also true that I have never ever seen a DC motor driver and I have no idea how it works. You see I am the funny type who needs to understand things. So...