# Diy sine wave oscillator

**URL:** <https://lookmumnocomputer.discourse.group/t/diy-sine-wave-oscillator/3478>\
**Category:** DIY STUFF\
**Created:** [May 4, 2021, 9:18pm UTC](https://lookmumnocomputer.discourse.group/t/diy-sine-wave-oscillator/3478 "2021-05-04T21:18:53Z")\
**Posts on this page:** 1\
**Showing post:** 10

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**Author:** ![analogoutput](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/analogoutput/32/29663_2.png) [@analogoutput](https://lookmumnocomputer.discourse.group/u/analogoutput)\
**Post date:** [May 14, 2021, 1:47pm UTC](https://lookmumnocomputer.discourse.group/t/diy-sine-wave-oscillator/3478/10 "2021-05-14T13:47:14Z")

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I just noticed this in the LM13700 datasheet.

 ![image](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/2X/0/0652dabfde1a82c66fc0bde46222fbf49f69dde7.png)

The following accompanying text says Figure 34 but I think they meant 35 (figure 34 uses a single LM13700)

> The circuit of Figure 34 employs two LM13700 packages, with three of the amplifiers configured as lo-pass filters and the fourth as a limiter/inverter. The circuit oscillates at the frequency at which the loop phase-shift is 360° or 180° for the inverter and 60° per filter stage. This VCO operates from 5 Hz to 50 kHz with less than 1% THD.

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