coil generator : tester of coils

[kt315]

yes. i did the board for '2#' column from the table, '2N3904 2N3906'. that means you can take any of them from column, or almost any.
for example, soldered 9014s, 'asiatics'. take them from chinese made boards.

[kt315]

b&w pic

[MartyJ1963]

I'd like to build this circuit and was wondering what voltage I needed to power it and what do I connect the output to? Sorry if these questions sound silly,,,I'm still learning. Thanks in advance. Marty

[6666]

The output voltage remains practically constant when the supply voltage varies from 3.5 to 15 V

You are building an LC RF oscillator what do you connect to such a circuit ?

[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

[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]

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]

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.

[kt315]

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

[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]

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]

now home work.

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

[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]

daluka knows. does chuubaba know?

[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