TL 071 FET Opamp oscillator making square waves 1Hz - 200 KC and a sine wave on a 100 KC frequency

The TL 071 FET Opamp is a very versatile Chip to make a square wave oscillator in a broad frequency band, say from 1 Hertz (or even lower) to max. 200 KHz.

This video, now, tells more about that and gives experimental results.

Both video’s are NOT made for children.

This video shows all the good properties of the TL 071 FET Opamp.
Turning the 220 K potentiometer gives a phase effect on a certain frequency band where the oscillator frequency is nulled-out on certain positions of the 220 K potentiometer in series with the (frequency dependent) capacitor C1.

Please note: also closing Switch 1 and Switch 2, bringing these 100 K resistors down to (say) 2 K or 4K7, have very substantial effects on the frequency. Try that out to get insight.

The oscillation suddenly comes back when the 220 K potentiometer is set to a further position, over that “null out point” and the circuit jumps to a much higher oscillator frequency in the 100 KHz band.

On that higher frequency band it is even possible to generate a pure sine wave on certain frequencies, say in the 150 KHz-160 KHz band (small band).

Could be very handy and useful when you need a sine wave in that frequency range.

All these properties give many good opportunities to use this TL 071 as an oscillator for whatever use.

All the videos hat I have published on You Tube can be found via my Channel Trailer: Link is

In thematic order you can find these video’s under the “comments” section.
Important: to find all the links to the (+/-700) video’s on my YT Channel, select, in the comments section, “NEWEST FIRST”

My books about electronics are available via the website from “Lulu”, search for author “Ko Tilman” there.

There is an important video via which you can buy a document where I give links to many of my video’s, published between 2010 and 2018.

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Regarding all my video’s: I constantly keep them actual, so the original video’s with the most recent information are always on YouTube. That is the source, and search there. When my video’s are reproduced or re-edited on other websites/channels you can not (!) be sure about the original content (=really working electronics with real properties for a purpose) and important adaptations to the circuits.

Be aware of that, I saw on the internet my circuits reproduced in a poor or not proper way.

I also found that people probably republish my circuits under phantasy names and/or with phantasy properties. Sometimes they want to find gold with them. I take distance from all these fake claims; I cannot help that it happens, sorry. Upload 9 december 2019.

[Gordonseries]

I will try it for a RF 100kc marker thank you

[goldlover]

Have you ever made a VLF Converter? and SBL-3 mixer

[mohammadalfauomey]

WHAT is the maximum frequency used with this chip?
Thanks