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Hello from Greece !!!

This is a Voltage-controlled oscillator (VCO). Αn oscillator that its frequency is controlled using a voltage signal. The VCO described here provide both triangular and square wave output. The control voltage can be varied between 5 mV to 5 V, to produce oscillation frequency from 10 Hz to 10 KHz.

Can someone please explain to me briefly the operation of the circuit ?

thank you

Beijing Shouxi Zhixin  Institute has successfully cracked MICROCHIP company's PIC24F family mcu and has a mature decryption technical measures for PIC24 family mcu.

Ah - I see now - yes, of course!

Many thanks for your kind help, Audioguru.

i need ideas to take an already assembled 4.3" lcd and make it able to read video from a usb and able to play that video with a push button.

any help is appreciated.

Yes you'll burn a starter motor out by running it continuously.

A starter motor uses A LOT of power.
It is not designed to run continuously, it is designed to start an engine in a couple of seconds.

I'm looking at R4 in the circuit and it looks like the zener diode D8 at just over 1ma. Is that the feedback ratio of U1? RV1 seems to determine the output voltage. Adusting the offset to produce the desired voltage isn't familiar. Can anyone help explain this?

The BZX79C5V6 zener diode that I recommend for D8 is 5.6V when its current is near 5mA.
R4 also has 5.6V across it so its current and the zener's current are 5.6mA.

RV1 is the trimpot to adjust the output offset voltage. It varies the output voltage plus and minus a small amount. When the voltage setting pot is set to zero then RV1 is adjusted so that the output is exactly 0V.

I'm looking at R4 in the circuit and it looks like the zener diode D8 at just over 1ma. Is that the feedback ratio of U1? RV1 seems to determine the output voltage. Adusting the offset to produce the desired voltage isn't familiar. Can anyone help explain this?

Hm, so how much does it take to power a starter motor? From a car?

Your "car" will probably need at least 4 times as much power to go slowly towards the wind or up a small hill.
Some countries have extremely small little cars like this one: