Search found 15 matches

by eoinitb
Tue Apr 12, 2005 9:50 am
Forum: General Discussion
Topic: suggest a circuit to convert 24vac to 12vdc
Replies: 13
Views: 2323

Re: suggest a circuit to convert 24vac to 12vdc

the problem with it going to high is that the input voltage which i tough was 24v is actually around 27 volts i presume this would explain why the voltage is going up to around 14v
by eoinitb
Mon Apr 11, 2005 12:08 pm
Forum: General Discussion
Topic: suggest a circuit to convert 24vac to 12vdc
Replies: 13
Views: 2323

Re: suggest a circuit to convert 24vac to 12vdc

im only going to need less than half an amp. im using it to power some ics which require anywhere from 10 -14v dc.<p>after following everyones advice i think im nearly there. the only problem im having is that the voltage fluctuates from around 9volts back up to around 14volts i think it might have ...
by eoinitb
Thu Apr 07, 2005 8:20 am
Forum: General Discussion
Topic: suggest a circuit to convert 24vac to 12vdc
Replies: 13
Views: 2323

suggest a circuit to convert 24vac to 12vdc

maybe its been asked before but could someone suggest a circuit for stepping down and converting 24vac to 12vdc
by eoinitb
Wed Apr 06, 2005 11:49 am
Forum: General Discussion
Topic: xr2206 as a fsk modulator
Replies: 11
Views: 2030

Re: xr2206 as a fsk modulator

sorry but where abouts in the data sheet does it say that
by eoinitb
Wed Apr 06, 2005 8:38 am
Forum: General Discussion
Topic: xr2206 as a fsk modulator
Replies: 11
Views: 2030

Re: xr2206 as a fsk modulator

thanks for your help guys i have kind of got it working <p>it seemes to produce the an output for logic 1 however when the input signal is logic 0 i am getting no output.see the oscilloscope scrren shot<p> http://members.boards.ie/eoinf/what%20i%20have.jpg <p>has anyone experienced this problem befo...
by eoinitb
Mon Apr 04, 2005 7:21 am
Forum: General Discussion
Topic: tranformer coupler question
Replies: 1
Views: 500

tranformer coupler question

i am building a project to send data on the mains cables i am having trouble source a transformer the tranformer i need has a turns ratio of 1:1:2 as can be seen in the pic below i have a few transformers which have a ratio of 1+1:2+2 could i use these if not could someone suggest a part .ive never ...
by eoinitb
Tue Mar 22, 2005 3:17 am
Forum: General Discussion
Topic: xr2206 as a fsk modulator
Replies: 11
Views: 2030

Re: xr2206 as a fsk modulator

i see from your circuit your are using 12v as vcc i am only using 5 v should i be using 12. also what range of voltage should be going into pin 3
by eoinitb
Mon Mar 21, 2005 1:10 pm
Forum: General Discussion
Topic: xr2206 as a fsk modulator
Replies: 11
Views: 2030

Re: xr2206 as a fsk modulator

the circuit i have built is as below it is from the datasheet i am getting absolutely no output from pin 2 Image
by eoinitb
Mon Mar 21, 2005 2:36 am
Forum: General Discussion
Topic: xr2206 as a fsk modulator
Replies: 11
Views: 2030

xr2206 as a fsk modulator

Has anyone used the xr2206 or similar chip as a FSK modulator? I have followed the circuit exactly as per the datasheet bottom of page 9<p> http://www.exar.com/products/XR2206v103.pdf <p>i am getting no output from pin 2 the FSK output pin when the input is applied to pin 9. i have read on other for...
by eoinitb
Thu Feb 17, 2005 7:24 am
Forum: General Discussion
Topic: recomend a transformer for coupling data with the ac lin
Replies: 6
Views: 926

Re: recomend a transformer for coupling data with the ac lin

its a college project where i have a FSK modulated wave form of a basic bit stream that i need to send down the mains cable i have all that side of the project im just strugling with the mains coupling the frequencys are going to be 5kz either side of 20khz
by eoinitb
Wed Feb 16, 2005 3:44 am
Forum: General Discussion
Topic: recomend a transformer for coupling data with the ac lin
Replies: 6
Views: 926

recomend a transformer for coupling data with the ac lin

i am building an electronics project which requires me to couple a data signal with the Mains AC line i have found the following circuit which i have been told will work. however i cant find a part number for the transformer can anyone suggest a transformer that would work <p>thanks<p>Eoin F http://...
by eoinitb
Mon Nov 08, 2004 6:43 am
Forum: General Discussion
Topic: sending voice on the mains power cable
Replies: 11
Views: 1558

Re: sending voice on the mains power cable

anyone got some sample circuits or any suggestions on where to llok
by eoinitb
Wed Nov 03, 2004 1:32 am
Forum: General Discussion
Topic: alternative parts for this circuit
Replies: 2
Views: 802

alternative parts for this circuit

i was thinking of building a project like this <p>http://www.designnotes.com/CIRCUITS/FMintercom.htm<p>however the lm566 and lm565 are not available locally can anyone suggest an alternative part.
any suggestions on wheteher this circuit will work or not would be great also
by eoinitb
Thu Oct 21, 2004 5:05 am
Forum: General Discussion
Topic: sending voice on the mains power cable
Replies: 11
Views: 1558

Re: sending voice on the mains power cable

this is a college project so design is more important than application the actual part of getting it onto the 220v mains cables without frying myself that i was having troble with .i have never used any form of transformers before and i understand i need to use them this time so any help with that w...
by eoinitb
Wed Oct 20, 2004 7:47 am
Forum: General Discussion
Topic: sending voice on the mains power cable
Replies: 11
Views: 1558

sending voice on the mains power cable

i want to design some hardware to send voice and if possible video over the mains 50 hz 220 v power rails can anyone suggest a circuit or where to start looking. cheers