Other Parts Discussed in Thread: LM358, TL3472, LM6142, TLE2142, TLC082
Help me figure out the electronic circuit. The electrical Board stands on the equipment that controls the proportional hydraulic control valve. The electrical Board came to me in a non-working condition. I'm not an electronics engineer, I'm a different kind of engineer. I had a very long time to understand the electrical Board, but still I managed to debug the electrical Board, but it works unstable. For a long time I could not understand what was wrong, but I think I figured out that the operational amplifier lm358-N from Texa Instruments works unstable (like noise).
I wrote to the support Department of texas instrument s for one purpose that I was helped to find a stable operating amplifier, in response, I was told that I should throw off the parameters of the operating amplifier. I don't know exactly what parameters of an op amp are needed, I'm not an electronics engineer.
A brief description of my scheme with waveforms. My scheme is similar to pulse width modulation. The lm368 leg 5 is fed a constant and rectangular signal, the output of the transistor is a rectangular signal with a frequency of about 40 kHz. The scheme works, but is unstable.
Please look at the two signal forms # 3 without counter 4017 and with counter 4017 that are fed to the proportional hydraulic coil, as well as the other signal forms. Help me find an analog of the lm358N and I want to know what is the reason for the instability of the lm358N ?
I have nothing against the company Texas Instruments just operational amplifier LM358-N is not suitable !!!
It may seem funny, but this is one of the main problems of my life. Hope for help !!!