Thanks, I'm sure these will be useful.
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| Some Powering circuits for LCD http://forum.lcdinfo.com/viewtopic.php?f=6&t=63 |
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| Author: | Spark [ Sun Dec 08, 2002 19:37 ] |
| Post subject: | Some Powering circuits for LCD |
Okay here is some sircuits for powering lcd displays. Most of these will give negative 9-12V, but there is also some that give -15V or even up to -48V. All of these works from +12V http://www.p5taylor.btinternet.co.uk/11.pdf http://www.reconnsworld.com/power_voltinvert.html http://w1.859.telia.com/~u85920178/power/vconv_01.htm http://www.hantronix.com/down/neg-invr.pdf http://www.aaroncake.net/circuits/vinvertr.htm I'm using one of those 555 based sircuits with an additional 7909 regulator and it seems to work fine. |
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| Author: | Henri [ Sun Dec 08, 2002 22:31 ] |
| Post subject: | |
Thanks, I'm sure these will be useful.
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| Author: | Spark [ Sun Dec 08, 2002 23:05 ] |
| Post subject: | |
Your welcome. Here is one more(ICL7660 and ICL7662) this has almost 100% conversion effiency! http://www.intersil.com/design/parametric/productresults.asp?t=55&i=216&i=219&i=1045 You only need this chip and 2 capasitors. Cannot go much easier
Those are also quite cheap about 2-4€ |
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| Author: | Henri [ Sun Dec 08, 2002 23:30 ] |
| Post subject: | |
Spark wrote: Your welcome. Here is one more(ICL7660 and ICL7662) this has almost 100% conversion effiency!
You only need this chip and 2 capasitors. Cannot go much easier Those are also quite cheap about 2-4€ That sounds very good. With the chip and 2 caps it would be a very easy way to make the negative voltage. Do you know where to get these chips easily ? |
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| Author: | Spark [ Sun Dec 08, 2002 23:51 ] |
| Post subject: | |
http://www.spelektroniikka.fi Suomalaiset voi katsella tuolta. Tarvii vielä etsiä josko löytyisi jokin toinen paikka. For those of You that doesn't live in finland You can find these ICL7660 and ICL7662 from RS-COM http://www.rswww.com There probaply is other places, but I dont wanna go thrue all those. Then there is also Intersil's own webshop, but i dont know do they deliver for end user. You could always try. |
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| Author: | samtech [ Mon Dec 09, 2002 1:36 ] |
| Post subject: | |
Thanks for the Links 
The one i'm using uses 3 voltage regulators and some capacitors , it has been designed by me to powerup the lcd externaly , it uses an 2 x 24v 3VA Tranformer to get the midle point has ground , then after the rectifier circuitr contitued by a rectifier bride ,two 1000 uF (one for eache chanel), 2 100 nF capacitor's rigt after the 1000uF , then comes the voltage regulators for 5 v (7805) , and the voltage regulators for -20 (7920) and the -8 (7908) right next come two more 10 uf cacpcitors , betwen the Vin and Vout if The ic's there is also an diode to prevent short's ans inverse curent's , it's also a very cheap and functional power suply , i've already head of those chips , but due to my display need of -20 volt i've made one off these , all componentts are easy to find and very cheap (about 8 € including the circuit board) As soon i have the schematic done i'll post it here in eagle format
Samtech |
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| Author: | Spark [ Mon Dec 09, 2002 13:30 ] |
| Post subject: | |
Your welcome. Here is few voltade doubler sircuits. Other is made with ICL7660 and I believe it might be possible to do an inverting voltage boubler with one icl7660 or 7662 chip. I just ordered that ICL7662. Altought my 555 based inverter worked fine. Just want something that doesn't have so many components. http://www.diystompboxes.com/pedals/vdbl.html http://www.reconnsworld.com/power_voltdoubler.html |
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| Author: | Spark [ Tue Dec 17, 2002 22:02 ] |
| Post subject: | |
Just little note for useng those icl7662. There might be the need of use some external stabiling for examp. Zener diodi. You could also try to change that output capasitor. I used resistor and zener diod. With out those my lcd goes crazy when I adjust contrast.
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| Author: | sbz24 [ Thu Jun 26, 2003 4:47 ] |
| Post subject: | |
Hello, which things I would need to get on the cheapest and simplest way -24 Volt from a ATX Pc suply ? that´s the last thing to connect my lcd thx |
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| Author: | rille [ Thu Jun 26, 2003 7:50 ] |
| Post subject: | |
DC/DC-Converter SIM1-524S. Look here: http://www.reichelt.de/index_direkt.html?SIM1-0524S%20DIL8+PpK-x9S4AQ4AAHWFQYY+D481. It's a german shop but you should get this (or a similar type). |
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| Author: | Guest [ Thu Jun 26, 2003 13:53 ] |
| Post subject: | |
are you shure thats it I need negative -21 Volt |
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| Author: | matchless [ Thu Jun 26, 2003 14:09 ] |
| Post subject: | |
you could also use a LT1051.with 5 parts you can get the negative voltage out of a pos. 12 volts. |
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| Author: | Guest [ Thu Jun 26, 2003 17:05 ] |
| Post subject: | |
Anonymous wrote: are you shure thats it
I need negative -21 Volt Simply connect the positive output to ground and at the negative you have the -24V. Input and output have no connection therefore you can put Vin- and Vout+ both to ground. |
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| Author: | stef [ Wed Jul 02, 2003 17:09 ] |
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TI provide a built-in componant to do it alone : http://focus.ti.com/docs/prod/productfo ... ber=PT5023 |
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| Author: | Guest [ Sun Aug 03, 2003 12:17 ] |
| Post subject: | |
stef wrote: TI provide a built-in componant to do it alone :
http://focus.ti.com/docs/prod/productfo ... ber=PT5023 WOW expensive thing euro 27 without the tax at Farnell, for the -12 volt version. Very handy though. |
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