Don´t laught please need some help about my project what i basically want is a solenoid "electromagnet" That switch its magnetic flux in a Oscillation fashion. Much like a speaker my solenoid is about 1.5 ohm. And to get the oscillation i research about relaxation oscillator and transistor oscillator but i went for the Rel for the of easy build. But i am very noob and i cant get it to work. The pic below show schematic and how i assemble it

Probably i am so noob that my theory is not valid. I want to have the output voltage the same as i take in in order to get stronger or softer magnetic field but i only get 0.04 mv at the output i have an pot to regulate the freq the voltage do increase or decrease in the output some but do not oscillate i think.. i thing i destroyed the ic or i connected it wrong. or it is the wrong circuit all together? hope i have explained my self clear sorry otherwise!

 

Assuming that the op-amp is an LM741 or equivalent:

What is the power voltage and source?

The cap looks very big for 1 μF; is that what it is? Do you have the polarity correct?

What is the value of the pot? Try removing it and using the 10k fixed resistor to see if it oscillates.

 

Hello yes it is a lm741.. and yea i tried switching from a 1 uf to a 10 uf that one is in the pic. Tried a fixed resistor to.. 10k

damn i suck at this

 

Are you using a dual voltage power supply? LM741's need a + supply, a - supply, and a ground. A couple of 9V batteries can be configured to work.

 

damn i suck at this

Adds the extra resistor as indicated or else your oscillator won't oscillate.

 

Adds the extra resistor as indicated or else your oscillator won't oscillate.

With a dual voltage power supply, the OP's original circuit produces a nice square wave at about 44 Hz.

 

Here is a schematic showing the batteries that make up the dual voltage power supply.

 

The following circuit works with a single 9V supply.