coil generator : tester of coils

[kt315]

Hi KT315 paypal sent

thank you but... why you send me 6 euro if i paypalrequested 8? why always the fee just on my side if i asked do fee on your side?
amazing....

[moorejl57]

How do we pay the fee on our side so you get the full amount?. I rarely use PayPal and ran into this issue when I sent you money for the DP board.

[6666]

thank you but... why you send me 6 euro if i paypalrequested 8? why always the fee just on my side if i asked do fee on your side?
amazing....
[ATTACH]46821[/ATTACH]

Hello KT315 paypal is doing something strange, I went through the Australian website it showed me what you should receive in euro with the fees, it should have been the correct amount in your account, it appears that we see something different in our accounts ,
they should not be charging you a fee, I do not get charged a fee to receive money that is strange
I will pay you the extra amount you have not received and your fee.
Could you please send me another paypal request for the extra amount, thanks.

[6666]

OK KT315, request has been sent, lets see what you get

[kt315]

good Bruce. thank you.


Amount received

1,85 EUR

Fee 0,45 EUR

Total 1,40 EUR

[6666]

good Bruce. thank you.


Amount received

1,85 EUR

Fee 0,45 EUR

Total 1,40 EUR

Thanks

[kt315]

tracking number is RE1025.......LT

on the way. thank you.

[moorejl57]

The link in post #132 includes a LTSpice file to test with. You can simulate a 10X probe (10M and 20pf in parallel) load and see what happens to the frequency.

So I breadboarded the Peltz oscillator and it works well! There seems to be a lot of additional capacitance from the breadboard and probe since the frequency is significantly lower than calculated. Used a 390uH inductor and a 100pf cap and get 543 kHz.

[dbanner]

Useful little circuit, very good.

[moorejl57]

Tried with 6.8mH and 100pf and got 112.4kHz and a distorted waveform.

[dbanner]

That very interesting, will the tank oscillate with say a 20n cap?(6.8mh)
Might be a good candidate for a coil tester circuit of sorts. What's the peak to peak across the tank. I need to read the article and play with the spice sim provided.

[dbanner]

I would like to develop a coil tester circuit for tuning home made coils, the idea goes like this:
After you have wound and shielded your coil, it is then connected to a tester. A preselected resonant tank frequency is selected by turning a rotary switch. Then a knob is turned until an LED lights, this indicates that the tank is resonating at preselected frequency. Capacitance of LC tank is then read off on a display. The heart of the circuit would be a peltz oscillator and a pic micro.

[dbanner]

The rotary switch described above would have selections for known frequency such as for tgsl, idx, and others frequencies etc.

[moorejl57]

That very interesting, will the tank oscillate with say a 20n cap?(6.8mh)
Might be a good candidate for a coil tester circuit of sorts. What's the peak to peak across the tank. I need to read the article and play with the spice sim provided.

OK, tested with 6.8mH and 22nF cap. The waveform is very nice and the frequency is 12.8kHz.

Using the frequency function instead of cursors, I get 13.15 kHz which is very close to calculated.

[dbanner]

That's pretty awesome sinewave, looks clean as a whistle. I noticed a negative supply voltage on the scheme.