anyone Know daul 12v to a 12v wallwart.
hey any one have an Idea How I can get a 12+v-0-12-v to work with a 12vac walwart,i can splice if I need to.it is a chinese preamp,one of the toys I play with fairly cheap so no big deal,or sould I just get anoter preamp that does 12v neg. and pos.
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If I understand your question, you want to use a 12VAC wall-wart to power a preamp. The preamp needs +/- 12VDC.
If that is the case then the wall-wart would need rectification and filter circuits. There is more to do than just splicing. Are you handy with a soldering iron? |
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The first circuit is a full-wave rectifier. It converts the AC to DC. The second circuit is a filter. It reduces ripple, i.e. AC noise, that remains at the rectifier output. If this is for a phono preamp, you might want to use batteries instead of a wall-wart. Batteries provide quiet power. The A23 battery size is 12v. Two of those and a battery holder and you are good to go. |
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hmmm they are not teribly expensive,wonder what the life is on themwith a daily draw @4-8 hours.
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What, in the name of all that is holy and revered, is a walwart?
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what about this http://www.ebay.com/itm/HIGH-CAPACTI...item2c73e9690a Larger mah value means longer lasting time of battery.
Duration of power up to 8 hours. Capacity of battery: 1800mAh. Input voltage: DC 12.6V. Output voltage: DC 12V . |
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