Yes - 7912 for (-) negative voltages. The 7912 needs a minimum load to
function correctly. An LED with series resistor should do the trick.
Might as well add one to the (+) regulator (7812) too - you then have
a pair of status LEDs almost for free :-)
cheers,
Dave
function correctly. An LED with series resistor should do the trick.
Might as well add one to the (+) regulator (7812) too - you then have
a pair of status LEDs almost for free :-)
cheers,
Dave
On 3 Oct 2012, at 10:06, fuyuhiko wrote:
> Thanks for all kind advices.
>
> I'm thinking to buy a power supply which produces +/-15V capable of
> 0.8A per rail, literally Power One HAA15-0.8-AG, then add 7812 and
> 7912 accordingly. Should I use the 7912 for the negative supply
> Shouldn't I?
>
> I can't calculate how much current the circuits consume from the
> schematics as I'm quite a beginner.
> All I can do is building the modules one by one and measure the
> current with multimeter. Though I guess there won't be so much current
> running as most of them use only one or two ICs such as 555timer. A
> LFO I will build uses five TL082s and two LM13700.
>
> Let me know if I might have a problem.
> Thank you very much anyway.
>
> --- In cgs_synth@yahoogroups.com, Richarius Molindarius
> <richmolindarius@...> wrote:
> >
> > Also - if possible, find out just how much current will be drawn
> from the
> > +V and -V sides of the power supply. THEN get 12 volt regulators
> that are
> > rated for a fair bit higher than that amount.
> > I don't know the general rule for heatsinks on voltage regulators
> but I do
> > believe it safe to say that if you're going to be drawing more than
> 0.5
> > amps from each of them, they should have heat sinks attached to
> them as
> > well. The heat sinks help to disperse the heat from the voltage
> regulators.
> >
> > On Tue, Oct 2, 2012 at 6:48 PM, <sasami@...> wrote:
> >
> > > **
> > >
> > >
> > > Yes, there is a problem doing that. Resistors control current,
> not voltage.
> > > You could add a 7812 and a 7912 regulator from the output of the
> +/-15 to
> > > give you +/-12V
> > >
> > > Ken
> > >
> > > >Hi there. I've just wondered if there is any problem that making
> a +/-12V
> > > from a +/-15V power supply by simply inserting some registers, I
> want to
> > > use
> > > both voltages so that I can mix some modules which I've taken
> from several
> > > designers.
> > > >
> > > >Kind Regards
> > > >
> > > >--- In cgs_synth@yahoogroups.com, "fuyuhiko" <hiko_goldenballs@>
> > > wrote:
> > > >>
> > > >> Thanks Dave for the information.
> > > >> I will plan what exactly I want to build.
> > > >>
> > > >> Cheers
> > > >>
> > > >> --- In cgs_synth@yahoogroups.com, Dave Kendall <davekendall@>
> wrote:
> > > >> >
> > > >> > MOTM used to make a PSU complete with front panel as a kit,
> (MOTM
> > > 900)
> > > >> > using a power one HBB15. (0.8A per rail)
> > > >> > Not sure if it is still being sold, but power-one's are dead
> easy to
> > > >> > wire up - basically just mains wire, socket and fusing, and
> then run
> > > >> > the ±15V to the distro board of your choice :-)
> > > >> >
> > > >> > Google should show up plenty of info on how to do it.
> > > >> >
> > > >> > cheers,
> > > >> > Dave
> > > >> >
> > > >> > On 19 Sep 2012, at 13:16, fuyuhiko wrote:
> > > >> >
> > > >> > > Thank you for the reply. Is the Power-one used for each
> > > synthesizers
> > > >> > > by encasing with circuits or does anyone make a power
> supply with
> > > it?
> > > >> > >
> > > >> > > --- In cgs_synth@yahoogroups.com, "goldencardigan"
> <dean.lowe@>
> > > >> > > wrote:
> > > >> > > >
> > > >> > > > Also keep an eye on ebay for power-one or condor brand
> linear
> > > power
> > > >> > > supplies. Lots of DIY'ers use them. You will spot one or
> two hiding
> > > in
> > > >> > > back of Fonitroniks racks on his website. You can find
> them in lots
> > > of
> > > >> > > different volatges and up to 1.5amps. Reasonably easy to
> wire up.
> > > >> > > >
> > > >> > > > --- In cgs_synth@yahoogroups.com, "fuyuhiko"
> <hiko_goldenballs@>
> > > >> > > wrote:
> > > >> > > > >
> > > >> > > > > Thanks for all generous replies, it's very helpful and
> I've
> > > been
> > > >> > > relieved.
> > > >> > > > >
> > > >> > > > > The linear power supply seems not bad, but can be
> confusing as
> > > >> > > Ove said.
> > > >> > > > > I will consider buying either Doepfer one or
> customizing the
> > > >> > > linear power supply to be easily used.
> > > >> > > > >
> > > >> > > > > Thank you very much and good luck for your inventions.
> > > >> > > > >
> > > >> > > > >
> > > >> > > > >
> > > >> > > > > --- In cgs_synth@yahoogroups.com, "roglok" <roglok@>
> wrote:
> > > >> > > > > >
> > > >> > > > > > These seem to be quite popular too:
> > > >> > > > > >
> > > >> > > > > > http://www.tiptopaudio.com/zeuspwr.php
> > > >> > > > > >
> > > >> > > > > > although, like the Doepfer, they provide only
> +/-12V...
> > > >> > > > > >
> > > >> > > > > > Here's an example for a pre-built 15V PSU, but be
> aware that
> > > it
> > > >> > > only delivers 500mA:
> > > >> > > > > >
> > > >> > > > > > http://www.blacet.com/misc.html
> > > >> > > > > >
> > > >> > > > > > --- In cgs_synth@yahoogroups.com, Ove Ridé
> <nitro2k01@>
> > > wrote:
> > > >> > > > > > >
> > > >> > > > > > > On 15 September 2012 23:09, fuyuhiko
> <hiko_goldenballs@>
> > > >> > > wrote:
> > > >> > > > > > > > Hello there.
> > > >> > > > > > > >
> > > >> > > > > > > > This is totally newbee question. I'm thinking of
> buying a
> > > >> > > linear power
> > > >> > > > > > > > supply to get DC +/-15V as building a power
> supply seems
> > > >> > > difficult for me.
> > > >> > > > > > > >
> > > >> > > > > > > > For instance;
> > > >> > > > > > > >
> > > >> > > > > > > >
> > > >> > >
> > >
> http://www.conrad-uk.com/ce/en/product/511815/VOLTCRAFT-VLP-2403-240W-
> > > >> > > DC-Power-Supply-Linear/2110330&ref=list
> > > >> > > > > > > >
> > > >> > > > > > > > But Im not sure if using this type of supply is
> efficient
> > > >> > > for the future
> > > >> > > > > > > > use.
> > > >> > > > > > > > Is there any drawback of using this type of
> power supply?
> > > >> > > > > > > >
> > > >> > > > > > > > Please let me know if you have any opinions.
> > > >> > > > > > > > I live in the UK.
> > > >> > > > > > >
> > > >> > > > > > > Hello. That's a lab power supply. If you intend to
> do any
> > > >> > > kind of
> > > >> > > > > > > eletronical prototyping work, you should have one.
> You
> > > won't
> > > >> > > regret
> > > >> > > > > > > getting it. I am not familiar with the quality of
> that
> > > brand,
> > > >> > > but the
> > > >> > > > > > > specs look ok.
> > > >> > > > > > >
> > > >> > > > > > > However, It would be a bit inconvenient to power a
> synth
> > > >> > > system from a
> > > >> > > > > > > lab power supply. You need to plug in cables for
> every time
> > > >> > > you want
> > > >> > > > > > > to use it, and not confuse the + and - cables,
> etc. For
> > > daily
> > > >> > > use, I
> > > >> > > > > > > would probably recommend something like the
> Doepfer A100
> > > kit.
> > > >> > > > > > >
> > > >> > > > > > > http://www.doepfer.de/a100_DIY_kits.htm
> > > >> > > > > > >
> > > >> > > > > > > --
> > > >> > > > > > > /Ove
> > > >> > > > > > >
> > > >> > > > > > > Blog: <http://blog.gg8.se/>
> > > >> > > > > > >
> > > >> > > > > > > "Here is Evergreen City. Evergreen�¿ is the
> color of
> > > >> > > green forever."
> > > >> > > > > > >
> > > >> > > > > >
> > > >> > > > >
> > > >> > > >
> > > >> > >
> > > >> > >
> > > >> > >
> > > >> >
> > > >>
> > > >
> > > >
> > > >
> > > >
> > > >------------------------------------
> > > >
> > > >The CGS Modular Synth home page: http://www.cgs.synth.net/
> > > >Yahoo! Groups Links
> > > >
> > > >
> > > >
> > > >
> > > __________________________________________________________
> > > Ken Stone sasami@... otherunicorn@...
> > > Modular Synth PCBs for sale <http://www.cgs.synth.net/>
> > > Australian Miniature Horses & Ponies
> <http://www.blaze.net.au/~sasami/>
> > >
> > >
> > >
> >
> >
> >
> > --
> > Take care,
> > Warmth and Peace,
> > Rich
> >
> > http://www.damian.deathlehem.com/ - my modular synth
> > http://www.soundcloud.com/Richarius - my latest composition snippets
> > http://www.youtube.com/dolphinicus/ - various module videos of mine
> / etc.
> >
> >
> > [Non-text portions of this message have been removed]
> >
>
>
>