555 symmetric power

210

03:00:44

This is a Symmetric power supply using 555.

published 8 years ago

BillyT

8 years ago

Nice circuit, maximum voltage for NE 555 is 15V.

rich11292000

8 years ago

👎

LeButch

8 years ago

Nice one

hurz

8 years ago

BillyT, maximum what I have seen is 18V, but most are only 15V.

BillyT

8 years ago

Hurz, yes this might be, the spec sheets I've seen state 15Vdc.

hurz

8 years ago

ICM7555 from intersil - Guaranteed supply voltage range 2V to 18V

hurz

8 years ago

http://www.intersil.com/content/dam/Intersil/documents/icm7/icm7555-56.pdf

hurz

8 years ago

Problem with voltages above 15V you do not get anything specified. Its not wrong to run the chip at 18V but you do not get a min/max/typ on any specified value e.g. current consumption is given for 5, 10 and 15V but not for any other voltage. So if you have extrem high current draw at 18V and your product does fail any tests its your problem, because intersil doesn't promised you anything 😉

BillyT

8 years ago

Sounds like they allow for some ripple in the power supply, no guarantees.

PauloPecegueiro

8 years ago

First of all I would like to thank you for commenting and presenting your ideas and questions here. In the circuit in question the 555 is working at its maximum voltage, according to the datasheet, practical tests can be done to ascertain the response of the circuit according to the input voltage. For those who were more interested, access the link below, a very interesting article about symmetrical source with 555.

PauloPecegueiro

8 years ago

http://electricalnote.com/symmetrical-dc-to-dc-converter-with-ic555/

aquif1990

8 years ago

nice circuit quite useful for opamp.

rich11292000

8 years ago

Lets see how good it is at 100ms/s. Its no good at all, 555 doesnt work on such a low impedance from high capacitance. 👎

hurz

8 years ago

18V positive are available, so whats needed is to generate a proper negative voltage. http://everycircuit.com/circuit/6275825619173376

PauloPecegueiro

5 years ago

@rich11392000 okay, Just include a properly buffer dude...

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