I see , thanksSince all the OpAmps are powered simultaneously in the LM324, it's just good practice to wire them, as spec noted, to prevent any "squirrely" (i.e., unexpected) activity.
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I see , thanksSince all the OpAmps are powered simultaneously in the LM324, it's just good practice to wire them, as spec noted, to prevent any "squirrely" (i.e., unexpected) activity.
Hy iods,thanks
well I would have used LM324 but I couldn't find a close opamp in LTspice , and about the R5 , if I use 100k I'll end up with 100Hz no ?Hy iods,
Neat schematic and the LT1007 is a nice opamp, but the LT1007 will not work with a single 12V supply line; the LT1007 needs +-15V (30V)
An ideal chip would be an OPA192 or OPA197
R5 needs to be 100K, rather than 200K, for 50Hz frequency, .
spec
No 100K, perhaps a bit lower, should be about right for 50Hz,... about the R5 , if I use 100k I'll end up with 100Hz?
My pleasure iods.btw , thanks
isnt F=1/t ? .. in that case we get F= 1/0.02 = 50Hz ? no ?
Thanks manThe formula for the frequency with that type of oscillator (integrating oscillator) is complex because it is affected by the level that the opamp output voltage swings to, but the LM324 output swings pretty close to the supply rails.
The best type of opamp for an integrating oscillator is a rail-to-rail output (RRO) type, like an OPA192.
I am too lazy to work out the exact timing so I just use:
period = 1/f, which for 50Hz is 0.02 seconds (20ms). A half period is thus 0.01 seconds (10ms) so make C *R = 0.01 seconds.
And on the circuit, 100K * 100nF = 0.01 seconds (10ms). And then adjust the resistor to get the exact frequency that you want from the circuit when it is built.
spec
your projects are just wowOld Technology, But This Inverter works Good.
Been using mine for Many Years.
http://chemelec.com/Projects/Inverter-2/Mosfet-Inverter.htm
Up to 400 Watts, Quite Good, But winding the Transformer Correctly is Important.