Replies to Minipulse Plus

[Coolmakina]

Hi again
Bellow is what i am getting at? TP3 with my scope.
If is something wrong, please warn me. Thank you.
https://photos.app.goo.gl/rU8s9dXZtPR1TAn27

[Qiaozhi]

Per Fig 14 of the assembly document, it should be like this:



You can attach the damping circuit in parallel with the coil.

I've added this useful diagram to the attachments here -> MPP Beach REV-E

[Coolmakina]

Per Fig 14 of the assembly document, it should be like this:



You can attach the damping circuit in parallel with the coil.

Oh... Mr. Carl you made my day.
Now i see a flyback.
God bless you sir.
Here is my flyback.

[Carl-NC]

Per Fig 14 of the assembly document, it should be like this:



You can attach the damping circuit in parallel with the coil.

[Coolmakina]

Hi Mr. Qiaozi,
English is not my Mother language so its Also possible that i misread something.
I built a monocoil.
If we consider A to be the starting of the wendings, and B the finish tip. I joined both. Then splied to Wires de from the joint point, One to RX, another to TX.
Is this wrong?
"Have you shorted the coil?"
I understand this as have jointed start of coil with end of the coil?
If so, yes i did.
Sorry if i am look like a dumb, which i acept to be a learning One...��

This is my connection.
From left to right. We can see 2 Wires..
The One marked with green tape is the ending tip of the coil. I joined with the start tip. From there i soldered 2 Wires, One to RX another to TX. Then added the camping jig.
Hope this PIC would clear what i Have done.
When help to find what os wrong.
PS: beside English not being my Mother language my phoen picks some caps and words for me...sorry Also about that.

[Coolmakina]

That sounds completely wrong. Have you shorted out the coil?

Hi Mr. Qiaozi,
English is not my Mother language so its Also possible that i misread something.
I built a monocoil.
If we consider A to be the starting of the wendings, and B the finish tip. I joined both. Then splied to Wires de from the joint point, One to RX, another to TX.
Is this wrong?
"Have you shorted the coil?"
I understand this as have jointed start of coil with end of the coil?
If so, yes i did.
Sorry if i am look like a dumb, which i acept to be a learning One...��

[Qiaozhi]

Both ends of coil (start and finish) are joined. Then from the joint One Wire go to pin 2 of TX connection, another go to pin 2 of RX connector. I Will upload photo of coil ASAP.
Thank you very much Mr. Carl for the Help.
Regards.

That sounds completely wrong. Have you shorted out the coil?

[Coolmakina]

Looks to me like the TX is working but the coil isn't connected. Looking at your photo I'm not sure you have things connected correctly.

Both ends of coil (start and finish) are joined. Then from the joint One Wire go to pin 2 of TX connection, another go to pin 2 of RX connector. I Will upload photo of coil ASAP.
Thank you very much Mr. Carl for the Help.
Regards.

[Carl-NC]

Looks to me like the TX is working but the coil isn't connected. Looking at your photo I'm not sure you have things connected correctly.

[Coolmakina]

IRFS840B should be fine.

Unless they are bad.
Seen a v?deo teste where testing with mult?meter set to diodo i shouldnt see voltage going trougth g and a of the MOSFET. Mines are ****fting voltage both ways. I think i Will replace them..
Any others ideas?

[Coolmakina]

[Carl-NC]

IRFS840B should be fine.

[Coolmakina]

Hi everyone,
i'm still stuck on this step 4 of the minipluse plus.
i started 5 units pcb, i wantend to build 5 minipluse plus. Along the way, 1 unit 79L05 was soldered backwards and still aside, It can be fixed later.
i was able to do step 1, 2 and 3 on the others 4 pcb's.
however i'm frozen at step 4.
i bought a hantek 6022be digital oscilloscope to help me out. it's not a great machine but i could afford.
the think is i don't have a large money fund to buy a decent one and a signal generator to proper calc the coil inductance and determine the damping resistor R4.
so i dig Surfdetector videos, (thanks's surfdetector!), and i built a damping jig as he described.
i also built a basket weave coil, according other threat's in this forum.
but i not reading the 350V flyback on my scope.
my probe and scope software is set to 10X, but peak to peak i only see 10,7V. and kind of a square wave trought the damping jig.
i toke some photos but i computer is crashing when i try to upload them.
is there any "check" i can make to see what is wrong with my step 4?

all parts checked and they are as spec, except that i have installed IRFS840B instead of IRF840....could this be the cause?

[Coolmakina]

Hi everyone,
i'm still stuck on this step 4 of the minipluse plus.
i started 5 units pcb, i wantend to build 5 minipluse plus. Along the way, 1 unit 79L05 was soldered backwards and still aside, It can be fixed later.
i was able to do step 1, 2 and 3 on the others 4 pcb's.
however i'm frozen at step 4.
i bought a hantek 6022be digital oscilloscope to help me out. it's not a great machine but i could afford.
the think is i don't have a large money fund to buy a decent one and a signal generator to proper calc the coil inductance and determine the damping resistor R4.
so i dig Surfdetector videos, (thanks's surfdetector!), and i built a damping jig as he described.
i also built a basket weave coil, according other threat's in this forum.
but i not reading the 350V flyback on my scope.
my probe and scope software is set to 10X, but peak to peak i only see 10,7V. and kind of a square wave trought the damping jig.
i toke some photos but i computer is crashing when i try to upload them.
is there any "check" i can make to see what is wrong with my step 4?

[Coolmakina]

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.

I was able to draw this scheme.
I Will try to out this in to a proto-board or so.