Phattline Posted November 1, 2004 Report Share Posted November 1, 2004 Hi I need -15V, and I have +15V and Ground.What parts I need to chance that?(I am on the way to built in my tr606 a tr909 bd pcb - and this thing need +15 ground and -15V) Quote Link to comment Share on other sites More sharing options...
illogik Posted November 1, 2004 Report Share Posted November 1, 2004 himaybe it is possible to do but i would suggest building(if you know how; high voltages!)/buying a small, bipolar (so with + and - supply) power supply.if you wanna build one;/www.cgs.synth.net/good luckbtw; your going to build a 909kick pcb IN a 606 ??? Quote Link to comment Share on other sites More sharing options...
Phattline Posted November 1, 2004 Author Report Share Posted November 1, 2004 hi illogicTo built a power supply is not possible becouse- this little thing must be batttery driven- (to program beats in e.g. the train)And yes a tr909 kick drum pcb in a tr606- thats what I want-not want I have it- but only the -15 V are leftthanx for the link, when i have time - i will seek some shematic out- Quote Link to comment Share on other sites More sharing options...
Phattline Posted November 1, 2004 Author Report Share Posted November 1, 2004 no that link dont solf the problem Quote Link to comment Share on other sites More sharing options...
moebius Posted November 2, 2004 Report Share Posted November 2, 2004 Hmm..I think best bet here is to use a charge pump voltage converter - at least Linear Technology LTC1144 and Microchip TC7662A are compatible with voltage ranges needed. Bye, Moebius Quote Link to comment Share on other sites More sharing options...
bosone Posted November 3, 2004 Report Share Posted November 3, 2004 i look at the matter, and decide to use a 79L15, to produce a -15V, coupled with a 78L15 which drives +15.both are connected to the same power supplyi think i will use this for building an korg ms20 filter clone Quote Link to comment Share on other sites More sharing options...
moebius Posted November 3, 2004 Report Share Posted November 3, 2004 Hi bosone,That's a standard method if you have center tapped transformer and don't have to power "too many" (no such thing ;)) analog synth modules.Bye, Moebius Quote Link to comment Share on other sites More sharing options...
smashtv Posted November 3, 2004 Report Share Posted November 3, 2004 Dug this up from usenet:One trick you can use with op-amps (and other things with low current draws) is to put two resistors in series between the terminals of a single voltage supply. If the resistors have the same value, then the mid-point will be at half of the voltage of the supply. So, you can take a single 9 volt battery, put two resistors (say, 1 K) in series between them, and call the middle point "ground" (a technically incorrect term, but that's what most people call the zero reference). As far as the op-amp is concerned, you just gave it a +/- 4.5 volt dual voltage supply. In practical circuits, you should add some capacitors between each battery terminal and the new "zero" point to keep it stable during fluctuations in current load. This method doesn't work well for higher currents, but does fine for a 741 op amp. - Mark Sokos (msokos1@gl.umbc.edu) Electrical engineer, computer geek (er, programmer), no-talent bum musician, and perpetual student http://www.gl.umbc.edu/~msokos1: alt.comp.hardware.homebuilt FAQ, ISA and other bus info, and schematics (mostly audio).Describes a method I have seen used in consumer stuff to power opamps. Your gear may be designed so that powering it this way will kill it, like if the draw from either pole was way higher than the other.....BestSmash Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.