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|This simple circuit is a good solution to the powering a dual supply op amp from a single battery problem. The circuit simply takes a positive voltage and inverts it. It uses only one 555 timer and a few other passive components, so it doesn't add much in the way of size and cost to a project.|
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|The output current of this circuit is limited to less than 90mA as this is the maximum current capability of a 1N4148 signal diode.|
|I have just made this circuit 12V in i was only seeing a max of -6V out. output oscillating from -3v to -6v, never stable. The circuit was powered for no more than five minutes and exsessive heat was drawn,left any longer i think the 555 would blown. i would not recomend this circuit, but by all means test it yourself.|
|The circuit operates as a free running AC Square Wave oscillator. Power is connected across pin's 4 +ve & 1 -ve. The output is then rectified i.e. converted to DC via D1 & D2 then smoothed via C3. For power line noise rejection, add a filter cap across the supply say 1000uf and a 0.1uf. This is a good common circuit for producing a -ve ref voltage from a +ve supply.|
|Eh guys can i know the o/p waveform of this circuit....|
|Hey, I made this circuit because i need dual power supply for my op amp project. It works BUT the power supply line (+12 V line) now has noise inteference. can anyone give a hint why it happens?|
|Some of you who think that this is an inverter that steps up voltage (12v to 120v) should think twice. This is a VOLTAGE or "POLARITY" inverter, which means this circuit switches polarity!|
|Ummmm, power input to the circuit is "V+". Vahid, 13V at 8 amps?!?!?! Damn. If you need about 1 amp, use an LM317. Excellant job on the documentation of the inverter, simple and to the point. Thank you!!!!!!|
|Hi can you help me please. i have 30volt DC and i vant to convert it to 13.5 (8A). i need any circuit design that is helpful.|
|where is the connection to power the circuit, sorry can't find it how will it operate without a supply? thanx|
|IC 555 there is only used for oscillation, to have an AC current and the output is connected to transformer to have a higher voltage.|
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