Found in a 90s Popular Electronics, this circuit uses a 741 to generate frequencies from 0.1 to 30 Hz. Observe the phototransistor feedback.
This circuit was found in a 90s American documentation from the 90s. The components are from that...
The AT21CS11 memory device offers an extended voltage range to accommodate lithium-ion battery...
The previous oscillators that use gatesshown in this section, and the 4093 in the basic version,...