Replies to Minipulse Plus REV-D

[Qiaozhi]

Please find the latest (REV-D) Build Document attached here ->
http://www.geotech1.com/forums/showt...lse-Plus-REV-D

[verdis]

Hello. This kit "Minipulse Plus REV-D" you can 'mount without the oscilloscope?
Thank You

[Qiaozhi]

Hello. This kit "Minipulse Plus REV-D" you can 'mount without the oscilloscope?
Thank You

Please read the Build Document. That will give you some idea of the complexity of the project.
But ... to answer your question directly, here is a quote from the document:

"Please note that it is highly recommended you have access to an oscilloscope during the setup procedure. Although it is not impossible to successfully build a working unit without one, you will need to be very careful and methodical during the construction. However, it is mandatory that you possess a multimeter."

[verdis]

Thank You

[tos]

Received my kit yesterday, starting to build...

The text at step 1 says:
PL1 (the positive terminal is the middle pin, and both outer pinsgo to the negative terminal)

But the pic in fig.1 shows +ve at pin 1 & 3 , also the circuit diag shows + going to gnd on the 79l05, = pin 1. Hence fig. 1 looks wrong.

/ToS

[Qiaozhi]

Received my kit yesterday, starting to build...

The text at step 1 says:
PL1 (the positive terminal is the middle pin, and both outer pinsgo to the negative terminal)

But the pic in fig.1 shows +ve at pin 1 & 3 , also the circuit diag shows + going to gnd on the 79l05, = pin 1. Hence fig. 1 looks wrong.

/ToS

Thanks ... I know what happened there. The image of the PCB needed to be replaced for REV-D, and there was an alignment issue with PL1. On the REV-D board the connector was moved over to make room for the series diode. If you look at Fig. 1 in the REV-C document, you'll see what I mean. I'll fix that later tonight and repost an updated document.

[Qiaozhi]

I'll fix that later tonight and repost an updated document.

Alignment error fixed in Fig. 1.
Please download new version -> Minipulse Plus REV-D

[tos]

Next small thingy...

In the component parts list,

C22, C22 100nF , should be C21, C22 100nF

/ToS

[Qiaozhi]

Next small thingy...

In the component parts list,

C22, C22 100nF , should be C21, C22 100nF

/ToS

Thanks.
I've updated the Parts List, as above.
Also, I spotted another error. The footer (at the bottom of each page) says REV-C instead of REV-D.

There's probably more, so keep looking.

[turboaleks]

C20 is missing in the Component Parts List.

[Qiaozhi]

C20 is missing in the Component Parts List.

Thanks.
Build Document updated -> Minipulse Plus REV-D
[Doc. Ref. 20150228]

[Borisimo]

Hello everone,

I'm new to this but in the process of building the kit MPP Rev D.
But after step one I'm getting -8.62v at pin 4 on U8.

I'm testing with 8 x 1.5 v batteries in series, Multi meter positive (Red) to pin 4 on U8 and multi meter com (black) to TP10.

Is it possible that I have fried something? I have re-checked the components, and their polarities a number of times.

Comments welcome

[CAS]

Pin 4 on U8 should give you -5V in relation to TP10 (0V) whereas Pin 8 will be +5V in relation to TP10. Check to make sure you have U1 in correctly as this is the -5V regulator.

[Borisimo]

CAS thank sfor you comments.

I have checked again but was still getting -8.62V so decided to replace U1 (79L05), however finding the part (I am in Morocco) is a fiddle...so the question is could I use one of these...

One reason not to the ampage is different, i.e. original is and this (7905) provides a regulated supply of -5 V and 1A current.
Also the legs are a little large for the holes in the board but I think they could be adjusted with a fine file

[Borisimo]

...one of these being a 7905 Voltage regulator http://www.engineersgarage.com/elect...e-regulator-ic

However as noted

One reason not to the ampage is different, i.e. original (79L05) is
-5 Volt 0.1 Amp

the possible replacement is (7905) -5 V and 1A current. Couls this cause problems later...
Also the legs are a little large for the holes in the board but I think they could be adjusted with a fine file