Replies to Minipulse Plus

[Ssqqar12]

I want a PCB file in pdf format

[Qiaozhi]

I want a PCB file in pdf format

It wouldn't be much use, as the PCB layout is double-sided with plated-through holes and ground plane on the bottom layer.

[Ssqqar12]

How do I get it ready with ingredients?

[surfdetector]

How do I get it ready with ingredients?

https://diydetector.co.uk/store/inde...roller=product

[Ssqqar12]

There are not enough products in stock

[Qiaozhi]

There are not enough products in stock

Select "Contact Us" at the top left of the screen and ask when there will be more stock arriving.
Your other alternative is to send the Gerber files to JLCPCB.

[Coolmakina]

Hi, anyone could give some hint.
I have Started MPP rev E.
Installed c10 of 22uf 16v plus the 79L05.
Can't measure -5v on pin 4 of U3.
Is it because capacitor?

[surfdetector]

Hi, anyone could give some hint.
I have Started MPP rev E.
Installed c10 of 22uf 16v plus the 79L05.
Can't measure -5v on pin 4 of U3.
Is it because capacitor?

Have you checked for correct orientation of the 79L05?

I did a series of videos for building the Mini Pulse Plus. You might find them helpful:
https://youtube.com/playlist?list=PL...x32pI5m-di2GTf

[Coolmakina]

Have you checked for correct orientation of the 79L05?

I did a series of videos for building the Mini Pulse Plus. You might find them helpful:
https://youtube.com/playlist?list=PL...x32pI5m-di2GTf

HI,
Thank you for help. In fact it was a trashy meter
BTW, i have seen all your videos. Great help for a newbie baby on electronics like me.
Thank you, regards, keep posting your stuff.
Stay cool.

[Coolmakina]

HI good friends,
i'm stuck with step 4 of my minipulse assembly.
i'm using a comercial coil wich i don't know the inductance.
i'm using a damping resistor of 470k and my scope only registers 11V peak.
is my resistor too high?
can someone lead me to instructions, how to determine comercial coil inductance and calculater proper damping resistor?
thank you very much,
best regards,

[Carl-NC]

470 ohms or 470,000 ohms? 470 might be about right, 470k is not.
If you have an oscope you can determine inductance by making a classic RL circuit and driving it with a square wave. Find the exponential tau (37% falling decay, or 63% rising decay, depending on how you measure) which is L/R. You know R so calculate L.

Once you have inductance you can put the coil in the PI circuit, remove the damping R, and look at the ringing on the oscope. The frequency of the ringing will be 1/[2*pi*sqrt(LC)]. Now you have C.

If you have L and C, the RD = 1/2*sqrt(L/C) for critical damping.

Or, put the coil waveform on the oscope and try different RD's until it looks good.

[surfdetector]

HI good friends,
i'm stuck with step 4 of my minipulse assembly.
i'm using a comercial coil wich i don't know the inductance.
i'm using a damping resistor of 470k and my scope only registers 11V peak.
is my resistor too high?
can someone lead me to instructions, how to determine comercial coil inductance and calculater proper damping resistor?
thank you very much,
best regards,

What Commercial coil are you using?
The easiest way to find the correct damping resistor is to build yourself a damping resistor jig. I have a video on my Youtube channel that outlines it for you.

[Coolmakina]

Hi Mr. Carl,
Really appreciate your Patience on helping others, newbies, like me.
I ordered my suplier 470ohms. My previous post is wrong.
Thank once again.
And Thank you Also for the instructions given.
How ever i would Need a signal generator. which i don't have.
I Will try to get One.

[Coolmakina]

What Commercial coil are you using?
The easiest way to find the correct damping resistor is to build yourself a damping resistor jig. I have a video on my Youtube channel that outlines it for you.

Hi Surf
You too are so kind on helping. Thank you very much.
I have a 11" DD from a old tx850. And a small gold finder
Mono cool. Bougth from Alibaba.
I Will for sure watch your v?deo. I am a subscriber of your Channel. Thank you sir.

[Carl-NC]

You can make a simple square wave oscillator from a 555 timer circuit or a single opamp. Lots of info on the Internet for this.