We found this circuit in a 1973 documentation. The null adjustment trimpot is 10k. The circuit can be powered by symmetrical sources from 9 V. The diodes on the bridge can be 1N4148.
We found this circuit in a 1994 National Semiconductor technical documentation. The circuit can be...
In the figure we have a basic PLL circuit with the LM567 or equivalent. The circuit is from a 1977...
This circuit was obtained from a Linear Technology manual from the 1990s. The sensor is of the...