coil generator : tester of coils

[kt315]

if you do not know is there a cap inside a coil or not connect a cap with 1% accuracy. russian uses 10nF, like a standart. i use 5% accuracy, do not have less.
i had gave the pics. look this pic on right side a value "C=10N" - is 10nF
and he gives values of resonanse he measured for rx and tx.

[Tibuck19]

Stupid question time, How do we know what Cap to put on C ?

[Tibuck19]

hgyuyuy

Perfect!

[Tibuck19]

nice. i am glad. let see your solder process and result. i will put some pics of board at near time.

Well do thanks

[kt315]

sent board today.

all the best

Greetings KT, Got the little board today. Do you have the BOM for the transistors please. Thanks.

nice. i am glad. let see your solder process and result. i will put some pics of board at near time.

[kt315]

Hello Good morning to all the Forum, I wanted to kindly ask the Gurus an information, I have a baunty hunter platinum, which works at about 7.8 Kh I wanted to ask if it was possible to work with a different coil, always respecting the inductors for the TX, but increasing the RX coil a lot to get a better yield. The two coils are tuned with conduits located inside the electronic circuit. Another question if I can use a reel already balanced or I have to build a new one?Thank you very much for your reply

just save it here like some kinda collection of similar requests.

[kt315]

Hello everyone, I would need help, for a 10 concentric Teknetic coil, to adapt it to a Bounty Hunter Platinum, which has a different plug, some of you have covered the connection scheme of the two coils, or can help me how to connect everything. Thank you.

just save it here.

[kt315]

thanks. yes, clear sine wave on LC. there is not problem with the generation on LC, but maybe 'preamp' on V3 works unright.
did not have much time for experiments. only measured whites coil and it was first issue for demonstrate you a result.

[rickb]

kt315: Nice to see that it is a sine wave at vt2. Thanks.

Rick

[kt315]

RX

[kt315]

[kt315]

connected BULLSEYE coil, TX. White's 6.59kHz. baddd. no generation ((( http://ipic.su/img/img7/fs/CIMG6332.1530295017.jpg
then looked on LC... signal is... but of hight freguency. seems there is an autoexcitation.
changed R10 on 22Ohm.

[kt315]

r6-r7

[kt315]

kt315: would you check the waveform at the junctions of vt2/c2, c2/r4 and r6/r7? Don't need pics, just waveform.

vt2-c2 - LC contour itself. pic.
c2-r4 - same signal. pic.

C -1000pF 2%.

[dbanner]

I think with higher cap(10-47nf), result will be more precise, depending on inductance of the coil being measured. The margin of difference increases with increasing of frequency.
Higher resonance frequencies being more susceptible to tiny variances in capacitance of circuit.