'E'-Choke

pre65 · Post by **pre65** » Tue May 17, 2011 10:37 pm

Mike H wrote:We'll find out at the regulator bake-off at Owston

Regulo 10 for 35 mins and allow to cool on a wire tray.

Mike H · Post by **Mike H** » Tue May 17, 2011 10:38 pm

Reminds me I found my can of freezer spray the other day

richardcooper2k · Post by **richardcooper2k** » Tue May 17, 2011 11:47 pm

i kinda meant theoretically or by measurement

Mike H · Post by **Mike H** » Wed May 18, 2011 9:16 am

Oh I see ~ haven't the faintest. I used me ears. Humour me and try it.

I imagine it's like a capacitor assisted by a regulator. So a pretty typical kind of regulator really. That probably doesn't help.

Mike H · Post by **Mike H** » Wed May 18, 2011 5:31 pm

Time for some updated diagrams:

FETREG004B equivalent schematic

Mike H · Post by **Mike H** » Wed May 18, 2011 5:32 pm

FETREG004B typical application connections:

Mike H · Post by **Mike H** » Wed May 18, 2011 5:44 pm

In case the parts list on the schematic wasn't too clear ~ component references as indicated on the PCB except where indicated *NEW* / *CHANGED*:

Code: Select all

R1              220k 5% 3W Metal Oxide
R2              470k 0.5W Carbon Film
R3              10k 2W 5% Metal Film
R4              3.3M Glazed Metal Resistor *CHANGED* was 2.2M CF
R5              10R 2W 5% Metal Film
R6              10k 1W SMD Thick Film *NEW* (on modified boards)
R7              10R 2W 5% Metal Film *NEW* put in F1 position!
C1              10uF 450V HV Radial Electrolytic *CHANGED*
C2              1000pF Ceramic Disc
M1              IRFB9N65A
ZD1             Zener Diode 1.3W 20V
ZD2             Zener Diode 1.3W 20V
D1              1N4007 (or 1N4006)
VDR1            V10N560K 56VDC Varistor

You will also need to put in this wire link (white):

Mike H · Post by **Mike H** » Wed May 18, 2011 5:53 pm

Nick wrote:Solid state devices often make very goot protection devices to prevent fuses failing

The little perishers! lol

Today's productivity results:

Mike H · Post by **Mike H** » Wed May 18, 2011 6:02 pm

NB: whoever it was mentioned that the total Voltage drop IN > OUT is around about 27V is right, it is. This is because the MOSFET gate is typically 5V, then add the odd bit of leakage through R4 and possibly C1.

Each series 10R will drop 1V per 100mA; max. 450mA (= max. 2W rating)

Max N · Post by **Max N** » Fri May 20, 2011 4:19 pm

Hi Mike
I'd like to send two of my boards back for the resistor mod please.
Could you pm me your address?
Thanks
Max

Mike H · Post by **Mike H** » Fri May 20, 2011 9:08 pm

I've done that haven't I?

Max N · Post by **Max N** » Wed May 25, 2011 10:07 am

Mike
I received the modified boards back this morning, thanks very much, I owe you several beers

I will build these up to the latest spec and let you know how I get on.
Cheers
Max

Mike H · Post by **Mike H** » Wed May 25, 2011 10:26 am

Crikey that was good, only posted yesterday afternoon

Max N · Post by **Max N** » Fri May 27, 2011 11:30 am

Mike
For C1 I have available either 4.7Uf 450V or 47Uf 450V - which would you recommend?
Cheers
Max

Mike H · Post by **Mike H** » Fri May 27, 2011 12:43 pm

Mmmmm ....

I would try ... both, see if there's any difference.

audio-talk

'E'-Choke

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