Hello everyone,
I am doing a DIY speaker which i want to have a micro , a guitar input with a bluetooth amplifier ( TDA7492 Bluetooth ) . Everything was ok until i met the problem about power for opamp to gain for micro & guitar , it requires V+ GND V- , and i just have the 12v battery for TDA 7492 .

So how can i make 3 pins power ( V+ GND V- ) from 12v Baterry ?

Thank you very much ,
Tungggg

 

Hello everyone,
I am doing a DIY speaker which i want to have a micro , a guitar input with a bluetooth amplifier ( TDA7492 Bluetooth ) . Everything was ok until i met the problem about power for opamp to gain for micro & guitar , it requires V+ GND V- , and i just have the 12v battery for TDA 7492 .

So how can i make 3 pins power ( V+ GND V- ) from 12v Baterry ?

Thank you very much ,
Tungggg

Use an isolated DC to DC converter to generate the negative voltage and tie its positive voltage to battery minus/ground.

 

Hi,
Im trying to find an IC for your needs but i cant find. Another solution is to create a circuit using a transformer.
Primary side is input like 110vac or 220vac as you like. On the secondary side a 12vac o 12 vac wiring.Center tap secondary.
Rectify a positive 12v and a rectify negative 12v if you know how to do it . Or else you can buy a ready made available power supply with an
output of your needs.

 

Isolated DC to DC converter...

http://m.ebay.co.uk/itm/DC-DC-Volta...3Aca52083215c0aa18b34f29adfff90840%7Ciid%3A22

 

Since the -ve supply is used only for the opamp, instead of a true GND you can use a virtual ground .
The 0V and +V rails are then treated as -V and +V respectively, avoiding the need to generate a true negative supply. The opamp's signal input and output would each require an AC coupling capacitor.

 

Isolated DC to DC converter...

http://m.ebay.co.uk/itm/DC-DC-Voltage-input-9-18V-to-output-12V-3W-Converter-Isolated-Power-Module-/172259911131?hash=item281b7da5db:g:ufcAAOSwrklVdrmy&_trkparms=pageci%3A37e9ed64-5671-11e7-94d4-74dbd180a564%7Cparentrq%3Aca52083215c0aa18b34f29adfff90840%7Ciid%3A22

Thank you , and i have found this circuit , can i use this for my projects ?

http://www.ebay.co.uk/itm/USB-Boost...ac59b48&pid=100005&rk=2&rkt=6&sd=262494961149

 

Thank you , and i have found this circuit , can i use this for my projects ?

http://www.ebay.co.uk/itm/USB-Boost-DC-5-24V-to-dual-power-12V-12V-5V-5V-3-3V-Linear-Regulator-Module/141966780979?_trksid=p2047675.c100005.m1851&_trkparms=aid=222007&algo=SIM.MBE&ao=2&asc=43781&meid=fa4b74583c9342ed9efc3a268ac59b48&pid=100005&rk=2&rkt=6&sd=262494961149

That would be OK but it is a kit so you'll need some smd soldering skills.