This signal conditioner humidity sensor was found in a 1980s Linear Technology documentation. The circuit uses components from the era that can be designed with modern equivalents.
In this oscillator circuit using 3 TTL inverters we have all the conditions for the frequency...
Figure bellow shows how the flip-flops of a 4027 can be connected to perform a divide-by-5 counter [odd...
This indicator for audio signals uses only 3 components. LEDs are common and the audio signal with...