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keron
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Posts posted by keron
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hello all,
please help me with ideas for generating ozone and also how to use it in water purification.(say a 500Lit water tank).you will get a lot of circuits to generate ozone but no ideas so far in using it for purification of water .you will get expensive equipement in market though.
a bunch of nice ozone generator ideas here
http://www.emanator.demon.co.uk/bigclive/ozone.htm
but what about voltage 5 kv is optimum or u need more volts to get more ozone.
is it possible to replace a neon transformer with the boiler ignition transformer in last project. In that case how to connect the mesh to it .mesh part is not clear i think.. -
thanks guru,
so for my application switching a load of 400-500watts in 220volt A/C(SUPPLY VOLTAGE VARIES FROM 160-220VAC) induction motor (in water pump for example).
Please suggest resistor values for the triac gate .50ohms will do.or a smaller value needed,?
330ohms resistor between gate and MT2 needed?
does changing MT1 and MT2(terminals)affect circuit by any means?
does the LED in MOC need a pulsed signal.or it will work from any std dc voltage(as in turning on a small DC switch)? -
thanks guru,
so for my application switching a load of 400-500watts in 220volt A/C(SUPPLY VOLTAGE VARIES FROM 160-220VAC) induction motor (in water pump for example).
Please suggest resistor values for the triac gate. 50ohms will do.or a smaller value needed?
330ohms resistor between gate and MT2 needed?
does changing MT1 and MT2(terminals)affect circuit by any means?
does the LED in MOC need a pulsed signal.or it will work from any std dc voltage(as in turning on a small DC switch)? -
hello guru,
but the datasheet specifies that current in MOC 3041 triac DRIVER LEd should be limitted.the value is 15 mamp..the circuit in previous reply by ante also shows the current limiting resistor in pin1.
how to provide 50ma to triac gate ? -
any idea about input to logic gate without pull down resistor when input is ,output from a logic gate itself.
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hello Ante,
that 330ohm resistor between triac gate and terminal i have used but omitted in the circuit diagaram sorry.but someof the data sheets says u need such a resistor between gate and terminal when you use sensitive gate triac.what do you say about that?.
the snubber circuit consisting of 47 ohm and 240v,0.33 uf caps also i have used.but not shown to make circuit simple.
only doubt is, i used supply from the battery of 9V to experiment with MOC3041.(TO SWITCH ON AND OFF).does this optocoupler need some kind off pulsed signals?iam not sure about the term i have used.wont this circuit switch on and off when i connect and disconnect manualy from the battery source?.
i have soldered the terminals wrongly at first trial.that is i connected mains to gate thinking its MT1.and gate was connected to pin 6 of moc.i have changed the triac after that but not MOC 3041.moc might got damaged by that?may be that is a cause iam not sure... thanks for the reply -
hello all,
i want make a solid state relay using MOC 3041 opto coupler triac driver and BTA 24 triac.i tried the circuit in data sheet of MOC 3041 but it is not working >:(.
the circuit i used is given as attachement.i want to switch a 1HP induction motor using solid state relay,supply volt 230v.current comes to <4amp.
please give suggestions. -
checked omni,not mentioned in any datasheet about connecting two logic gates.should i post it for opinion in forum?
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omni.
one more doubt.silly it seems.i read somewhere that every gate has to be pulled down /up using resistor.is that means when using the out from one gate as a input to other gate (example pin 2 of 4001 it need to be pulled down too since its input is from pin 4 of same ic,)i havent did that.i used pulldown resistors only at inputs from probes)will that be a problem? -
none of them controlls two levels simultaneously.thats why i designed y circuit.i have seen almost every circuits u send to me during my serach for a level controller.i think my circuit is more simple than most of the circuits u send.
but this one
http://www.uoguelph.ca/~antoon/circ/sensor3.htm
is impressive i havent seen this one before.but one thing if this capacitive method is not realy capacitive as some one has comented .why to use so much complicated circuit.anyway its still resistive rt?
and in this one
http://www.zen22142.zen.co.uk/Circuits/Alarm/water_lev_alm.htm
can you tell me why the unmarked probe that carry 5 volt from 7805 is grounded using 100nF and 100uF capacitors.is it for de coupling.then i should try that first.both caps needed for it?why that circuit dont use a signal amplifier -
i will do it.the battery part.
you are wrong omni for the first time.i have only basic(what i have studied in my school years)knowledge in electronics.i am a physician with some interest in electronics.can you help me to design a water level sensing probe better than what i designed?the sensing part is basicaly conducting electrode.please.. -
hello Omni,
can you explain more about powering your circuit (CMOS) with a small DC battery with an in-line switch.
the MOV is used across the contacts of relay which switch on and off the pump.i used it becuase i have seen sparks acrosss the contacts when pump switches off.
one more question.i have providing input to logic gates from probes which conducts when water come in contact with them.VDD is the input voltage.but at first i tried connecting it directly that is Vdd through water to gate input.but the probes need to be almost in contactfor that to work.
so instead of that i used BC548 to anplify i think the signal.the signal from probe is connected to base of BC547 through 150k trim pot..VDD (vss)to collector and emitter is connected to input of logic gate.which is pulled down using 10k resistor.
any problem with the said idea? -
hi omni,
as i metioned before the problem iam facing now is (though actually not a big issue)when i sswitch the pwersupply to circuit on and off rapidly in succesion it makes the pump on.but it still follows the logics and turn soff immediately if no water in lower tank or full tank above.
one day i noticed the pump turning on and off frequently without any reason.i have to switch off the circuit to stop it.
i have put a MOV across the relay contacts.i cant find out why its happening.my supply voltage is 160v only(230 v idealy).any idea about the reason? -
the circuit works in 12 volt DC.CMOS logic gates maximum working voltage is 3- 18 volt.
the sump in my use is not what you have mentioned.here in india because water supply line pressure is low we collect water in a tank below floor level from supplypipes and pump it to a overhead tank.its very common here.
you could have published it and saved my valuable time used for designing it...lol .anyway can you suggest any modification especially the rapid switchone cause the circuit to turn on prob... -
many have send mails to me saying that they are unable to open the picture of main circuit ,the bmp image .so iam including a jpeg format of same pic.sorry for the inconvenience...
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in the diagram
UL=UPPER TANK LOWER PROBE
UU=UPPER TANK UPPER PROBE
LL=LOWER TANK(SUMP)LOWER PROBE
LU=LOWER TANK(SUMP) UPPER PROBE
RED led turns on when lower tank is empty and remains on till water reaches upper sensor level.
green led turn on when water reaches upper probe of upper tank& after that when water remains between two sensor probes in upper tank.
invites methods to make circuit more immune to noise.and other possible errors..
one problem i have found so far is sometimes its not switching on as expected but ONCE it turns on it will definitely turn off when water level goes beyond lower level in lower tank and upper level in upper tank.but it is not happening always.when i check it it functions normally.(this was detected accidently when i was near the pumpdoing something else. it switched on as the water slowly filled the sup and pumped till it went beyond lower level probe in sump .this cycle repeated till i turned off the circuit)should i change the schmidt trigger IC4093 back to 4011.OR IS IT DUE TO POOR SUPPLY VOLTAGE(150 TO 170 USUALLY INSTAED OF 230V)..any idea why its happening?i think its in the put stage to logic gate is the problem?not the main circuit...SOMEBODY PLEASE REPLY....... :'( -
hello friends ,i have developed a simple but efficient water level monitor and pump controller for OVER HEAD TANK.it has an added feature of monitoring the water level in sump or well if needed.i developed it mainly for my home,where i need to pump water from a small tank in my basement to a large OHT(over head tank).
i have serached for a circuit like this for weeks,but couldnt find one.so i designed it using CMOS 4001 & 4011.for noise immunity i have used 4093 schmidt trigger IC instead of 4011(i have only a broad idea about all these jargons ,iam not sure if its appropriate)..the pin numbers are clearly shown to make design idea to practical circuit easier.
The input to the logic gates can be either through a float switch or signal through a pair of conducting probes (which need to be amplified using transistors).from circuit its clear that it works on S-R latch feture of logic gates.i have provided visual output for the staus monitoring(it works in a limited way though)of tanks without extra wiring.the building cost for the circuit is less than 10 US$ including the mechanical relay and delay circuit(delayed turn -on) used with it.
Out put from logic circuit is amplified using a darlington pair to drive a 100ohm 6V relay.this relay is used to switch on a delayed turn on relay circuit which switch on the main terminal to pump.(please see the pdf attchement).I used two relays for high voltage isolation as an extra protection.
the probes are made of stainless steel wire (from paper clip)mounted on PVC pipes.wires are soldered to steel pins and joints made water tight with sealent adhesive.(inviting ideas for better as well as cheaper probes) .the central control circuit can work with input from Ultrasonic level sensor probes/IR level sensors as well as float switches and simple moisture probes.just modify slightly according to each type of input.
After 2 months of continuous use the only one problem i have faced so far is sometimes if you switch one and off the circuit rapidly after 3 or 4 attempts it will turn on the pump regardless of water level status.but if the water level in upper tank is at it maximum or in sump if it is below lower limit it will turn off pump immediately(anyway pump will not run dry or no overflow,it fullfill the purpose) )
more details are there in the pdf file.
special thanks for logism for designing this circuit.if you are into simulation of the circuit please get the logisim from website
http://ozark.hendrix.edu/~burch/logisim/
i am ready to send the .*crc file if u are interested in testing and simulation.it is very easy to construct the circuit from the bmp image in the previous post. the site restrictions prevent me from uploading the file.
download link to logisim http://ozark.hendrix.edu/~burch/logisim/download.html
I am inviting attention of all members to please go through this circuit and provide with ideas to improve the CIRCUIT.Better level indication ideas will be appreciated also please point out the mistakes i made.thank you.
help with solid state relay
in Electronic Projects Design/Ideas
Posted
it was 50ohms itself.thank you very much.let me try this out.
one important thing,BTA 24 will serve my purpose rt?load is not that heavy i guess for BTA 24 600CW.
http://www.st.com/stonline/products/literature/ds/7470/bta24.pdf
i think A1 and A2 in datasheet is same as MT1 and MT2 ?in the diagram by ante MT1 connected to pin 6 through 50ohms resistor rt?
quarter watt resistors will be sufficient,or do i need to use 1watt or something like that or 50ohms and 330ohms.
finally MOC 3041 can be used to switch this triac rt?
if iam using 9volt supply what should be the value of current limiting resistor?
what are the possible mistakes by which we can damage MOC 3041 or triac(like connecting gate of triac to mains )?