This circuit was obtained from an 80's Radio Electronics. The circuit decodes “scrambled” or sinusoidal encoded signals by providing an audio signal at the output.
The circuit shown in figure 1 was suggested by Maxim (www.maxim-ic.com) based on the DS2786B...
This 130 V drive uses an integrated circuit not very easy to find, which is the LM143. The circuit is...
We found this conventional astable circuit in Ferranti's 1974 transistor manual. Transistors are...