| ari polisois |
For a specific application I am looking for a voltage stabilizer circuit, to control a sinewage ( 50-60 Hz ) and keep the voltage
at 1 V peak.
Does anyone know about such device ?
Thanks. |
|
|
| Frank Berry |
| You could use a 50 or 60 Hz wein bridge oscillator with a lightbulb in the feedback path to keep the level constant. |
|
|
| peranders |
If you can tolerate some distortion you don't have to have light bulbs, just have the the gain at 3.1 or something, slightly over 3.
You can also use a sinus signal IC like XR2206 or ICL???? (Intersil had a very similar IC but I have forgotten the number)
http://www.exar.com/product.php?Pro...XR2206&areaID=7 |
|
|
| ari polisois |
Thank you Frank and thank you Per-Anders.
As soon as I build and test the device I'll let you know, just in case you would be interested.
It's a Turns-meter ( that is a device to measure the number of turns of a transformer winding).
I forgot to state that I might need quite a high current for the purpose ( say 2-3 amps at 1 Volt ).
Cheers, |
|
|
| jackinnj |
the LM317 can actually be used as an A.C. regulator -- it won't go down to 1.000V -- the lowest will be 1.25 which is the reference (or 1.249). The strategy is to use two devices. The picture below is from the product description at national.
i haven't done this personally, so YMMV.
oh, you can also modulate the ADJ pin of a three pin regulator with an a.c. source -- they make a terrible amplifier but it does work. |
|
|
| peranders |
| quote: | Originally posted by ari polisois
Thank you Frank and thank you Per-Anders.
As soon as I build and test the device I'll let you know, just in case you would be interested.
It's a Turns-meter ( that is a device to measure the number of turns of a transformer winding).
I forgot to state that I might need quite a high current for the purpose ( say 2-3 amps at 1 Volt ).
Cheers, |
Just use 12 VAC or something and two voltmeters, one at the primary side and one at the secondary. Take those two measurement values and divide. Why make it complicated? |
|
|
| ari polisois |
Per-Anders,
I was considering the case where you do not know anything about the transformer ( not the primary turns, not the secondary turns, not the ratio ).
But, in fact, I can manage to have one turn added on top of the windings (which is possible in some cases), feed it with a known ac voltage and measure the voltage at each winding that I want to check.
This(these) voltages will disclose the number of turns based on the ratio.
Example : I feed the added turn with 0,2 Volts ( the current should not be too high, in most cases ). If I measure 200 Volts across one of the transformer's winding, then it should have 100 turns.
Of course, if more windings could be added, then the mesure would be more reliable and you could use a higher voltage than 0,2 V.
Correct ? |
|
|
| jackinnj |
| quote: | Originally posted by ari polisois
Per-Anders,
I was considering the case where you do not know anything about the transformer ( not the primary turns, not the secondary turns, not the ratio ).
But, in fact, I can manage to have one turn added on top of the windings (which is possible in some cases), feed it with a known ac voltage and measure the voltage at each winding that I want to check.
This(these) voltages will disclose the number of turns based on the ratio.
Example : I feed the added turn with 0,2 Volts ( the current should not be too high, in most cases ). If I measure 200 Volts across one of the transformer's winding, then it should have 100 turns.
Of course, if more windings could be added, then the mesure would be more reliable and you could use a higher voltage than 0,2 V.
Correct ? |
if you don't know anything about the transformer just use a signal generator at 1kHz -- any old voltage will do providing your DVM is up to measuring -- most DVM's will read sine waves acurately to at least 1kHz -- at this frequency the generator will see a relatively high impedance so it won't be overloaded -- I used this method for years with an old Heathkit generator (now modified for 0.001% THD) . It really works. |
|
|
| ari polisois |
Per-Anders,
You are very kind.
Everything cleared.
Bye |
|
|
|
