coil generator : tester of coils

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The output voltage is stable over a wide range of power supply voltage. This makes the circuit versatile regardless of battery drain. However the maximum power supply voltage is a function of the components tolerances and must be kept below mentioned tolerances by a safety margin as best practice for design rules.

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The purpose of this circuit is to measure resonance frequency of the coil that is connected to the circuit. Therefore you would naturally need to connect output to a device which measures frequency of the output signal. Oscilloscope or frequency counter.

[dbanner]

I don't know, that's why I was asking. Does the output go to the oscilloscope? I'm still learning these things. I have an oscilloscope but I'm still learning to use that too. also, does that mean I can use any voltage then between 3.5v and 15v? I wouldn't ask if I was uncertain but I thought making it would help me learn more about coil building. Thanks. Marty

You cannot learn basic electronics theory on forum. This you must do for yourself. There are very many basic electronics tutorials available online. With 2 months of intense study, you can become good with fundamentals of electronics theory. Then everything will become easier to learn more as you go along.

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now home work.

what is a voltage of power supply in this schematic?
- Marty?

Russian alphabet I don't know, but it looks like electrolytic caps are rated 6? So I'm guessing 6 volts rating. So power supply is restricted to below this. I say 3-4.5 volts.
What I find interesting is C2 and C3, connected back to back, as substitute for non polarized cap.

[6666]

any voltage then between 3.5v and 15v

You published the information, if you are now saying its wrong then why did you publish it
thats all I have to say on the matter

[kt315]

daluka knows. does chuubaba know?

[daluka]

now home work.

what is a voltage of power supply in this schematic?
- Marty?

you can not use voltage than you use capacitors' voltage maximum. ... then you have to use less supply voltage. again remember about safety reserve. ... minus 4 Volt. you get maximum of your supply level voltage.

[kt315]

now home work.

what is a voltage of power supply in this schematic?
- Marty?

[kt315]

look on third column of a table. you see the voltage C-E max.



you can NOT use KT315G in schematic with 20V power supply. just ONE cause - it is 15V transistor.

[kt315]

also, does that mean I can use any voltage then between 3.5v and 15v?
---
i am feeling like idiot sometimes here ((( be cause must teach people... with my poor english i can not tell you much.

main rule in electronics you can not supply a schematic above max voltage Collector-Emitter of any transistor in the schematic.
if you take a transistor with max 20V C-E - ok, you have not connect it to 20V and more power supply.
also, thats maximum, for safety you must have a some reserve - 20 minus 5 V. ie you get 15V.
you get 15V is maximum voltage for power supply for your schematic.

still rule. you can not use voltage than you use capacitors' voltage maximum. ie you use 16V caps electrolitics.
then you have to use less supply voltage. again remember about safety reserve.
16 minus 4 you get 12 Volt. you get maximum of your supply level voltage.
but you can set more value caps. for example 50V. then you can use 50 minus 5 = 45 Volt power supply.

those rules are simplest and classic in whole electronics.

no reason to ask what voltage to use for a schematic you see - look on transistors, look on electrolitics.
now you clear sure know power supply voltage for any schematic without my answers and university lessons of dead drunk professor of electronics cathedra.

[kt315]

this schematics with mod, by russian people from forum. for more full informaton i have to touch also it.

[6666]

For general purpose PI and VLF building you dont need anything fancy with bells and whistles, most cheap multimeter's come with a freq counter about 2 megs is enough.
However you can buy a 1Hz-50MHz Crystal Oscillator Tester Frequency Counter kit for $5.00 posted on Ebay, but I would spend $15 and get a fully built and working unit. Unanderra is about 600KM north from me and its easy to get marooned by flood waters in New South Wales.

[MartyJ1963]

Thanks 6666,,,,I best invest in one of those then now,,lol. Is there a certain kind I need? I just thought that with building this circuit it would help me learn a lot more about coils and building. I'm ok now at building Mono coils for the PI's,,but even though I've learnt to make my DD's and concentric's neater and get the Inductance better and closer I still need to learn a lot more about frequencies/Phases/nulling etc. I love this forum to bits,,,I'm online with Geotech every day without fail cos' there's so much to learn on here and I'm fascinated by everybodys skill and knowledge on this site. Thanks for those answers anyway, I appreciate it. Is Unanderra down your way? Somewhere in Victoria? My sister went on a school trip sometime between 1975-77 and she got stranded there for a week cos' of severe floods. Thanks. Marty

[6666]

I don't know, that's why I was asking. Does the output go to the oscilloscope? I'm still learning these things. I have an oscilloscope but I'm still learning to use that too. also, does that mean I can use any voltage then between 3.5v and 15v? I wouldn't ask if I was uncertain but I thought making it would help me learn more about coil building. Thanks. Marty

any voltage then between 3.5v and 15v, and you connect a frequency counter to an oscillator

[MartyJ1963]

I don't know, that's why I was asking. Does the output go to the oscilloscope? I'm still learning these things. I have an oscilloscope but I'm still learning to use that too. also, does that mean I can use any voltage then between 3.5v and 15v? I wouldn't ask if I was uncertain but I thought making it would help me learn more about coil building. Thanks. Marty