Build your own USB tuner . Questions about hardware

Minitiouner V1.0 hardware question.

Postby on4aol » Mon 10 Dec 2018 09:19

Goodday to all
I bought my kit a few years ago from BATC.(Version V1.0 with the Sharp tuner)
So now it's the time to get one with it :D
I wonder what the purpose is of the switching PSU module PSU1? ( MP1584)
Can this PSU not simply be omitted and supply only with 12 V directly ( and bypass the PSU1) to the 5V regulator ( U4) or am i missing something ?
I know that de 5V regulator is a low drop version , or is it maybe that normal regulators like a 7805 are to noisy ?
73 Luc on4aol
on4aol
 
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Re: Minitiouner V1.0 hardware question.

Postby F6DZP » Mon 10 Dec 2018 16:41

Hello,

If I remember well, the first regulator (5v) must receive 6v max
so the little chineese pcb (PSU1) allows us to give at the input anything between 8v and 18v and has its output set to 5.5v

yes a 7805 is much noisy.

73
Jean-Pierre F6DZP
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Re: Minitiouner V1.0 hardware question.

Postby on4aol » Mon 10 Dec 2018 16:55

Ok , thanks Jean Pierre.
I will order one on the internet
Hope to get it work soon .
73 Luc on4aol
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Re: Minitiouner V1.0 hardware question.

Postby on4aol » Thu 20 Dec 2018 10:45

Just to let you know that's everything works fine .
I haved to replace the 5V fixed LDO regulator with another type because the stock was zero.
For your interest ( and for other candidate builders) it is a BA05CCOT LDO 1% 1A and 25 Vin regulator from ROHM semiconductors

73 Luc
on4aol
 
Posts: 7
Joined: 31 Dec 2014

Re: Minitiouner V1.0 hardware question.

Postby F6DZP » Fri 21 Dec 2018 13:37

hello,

I can send you a MCP1826S-50EAB.

send me a private mail with your address.

73
Jean-Pierre F6DZP
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Re: Minitiouner V1.0 hardware question.

Postby on4aol » Fri 21 Dec 2018 16:52

Hello Jean-Pierre,
Thanks for your kindly offer , but i think it will work .
I hope to test it soon with a sat signal if the weather allow me to setup the dish.
If a get problems a wiil get back to you.
Joyeux Noel , Bonne Année
73 de on4aol Luc
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Joined: 31 Dec 2014

Re: Minitiouner V1.0 hardware question.

Postby on4aol » Sun 23 Dec 2018 08:30

MKT1.jpg
MKT1.jpg (114.85 KiB) Viewed 1695 times




It's alive ! ;)
Dish 85 cm pointing to Astra 1 19.2 ° E
Now we can go further on with experiments
73 Luc on4aol
on4aol
 
Posts: 7
Joined: 31 Dec 2014

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