Alt-BEAM Archive

Message #05432



To: beam@sgiblab.sgi.com
From: "Richard Caudle" rwcaudle@hpamonon.com
Date: Tue, 27 Jul 1999 09:49:15 -0500
Subject: [alt-beam] Maxxim chip doubler...



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Morning all,

I've been loosely following the thread about the voltage doubler. I have a=
3VDC to 5VDC converter that works pretty god. It's made by Maxxim. 8DIP,=
and inductor, and a small cap is all it takes. I'll have to dig up the ci=
rcuit when I get home from work, but I'll post it if anyone cares to know a=
bout it. It seems like a smaller alternative to the other charge pumnps th=
at I've seen. They also make a TTL to RS232 converter that charge pumps 10=
VDC. It may take some tinkering, but it could be something BEAMish, if use=
d in an unusual way. I'll find that one when I get home, too.

Richard


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>
Wilf Rigter There are numerous special purpose chargepump and buck/boost converter =
chips
form Maxim and others. The challenge is to make a chargepump or =
converter
using a spare 240 inverter from bicore application or similar. In other
words, if it is conceptually simple (not a black box) and practically =
comes
for free. That's what makes it "beamish" and imho the same principle =
applies
in using one spare output of a PIC controller as a charge pump to =
generate
-5V ie for RS232, which may be a new idea (at least one which I have =
not
seen before).

Wilf Rigter mailto:wilf.rigter@powertech.bc.ca
tel: (604)590-7493=20
fax: (604)590-3411

> -----Original Message-----
> From: Richard Caudle [SMTP:rwcaudle@hpamonon.com]
> Sent: Tuesday, July 27, 1999 7:49 AM
> To: beam@sgiblab.sgi.com
> Subject: Maxxim chip doubler...
>=20
> Morning all,
> =A0
> I've been loosely following the thread about the voltage doubler.=A0 =
I have
> a 3VDC to 5VDC converter that works pretty god.=A0 It's made by =
Maxxim.=A0
> 8DIP, and inductor, and a small cap is all it takes.=A0 I'll have to =
dig up
> the circuit when I get home from work, but I'll post it if anyone =
cares to
> know about it.=A0 It seems like a smaller alternative to the other =
charge
> pumnps that I've seen.=A0 They also make a TTL to RS232 converter =
that
> charge pumps 10VDC.=A0 It may take some tinkering, but it could be =
something
> BEAMish, if used in an unusual way.=A0 I'll find that one when I get =
home,
> too.
> =A0
> Richard



5434 Tue, 27 Jul 1999 12:47:07 -0500 [alt-beam] Re: Maxxim chip doubler... "Richard Caudle"
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-----

Ah so! (he says after finding out he totally missed the point of the exerci=
se). {8} (this symbol indicates the infinite cranial space that remains v=
irtually unoccupied.

RC =

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>



Ah so! (he says after findi=
ng out he =

totally missed the point of the exercise).  {8}  (this symbol =

indicates the infinite cranial space that remains virtually =

unoccupied.

 

RC =






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