7-segment display driver (CB20551E)

We found this circuit in English documentation from 1996 for PCs. The circuit is for common cathode display.

Cascading 741 (CB13431E)
With this configuration it is possible to obtain an 80 dB gain from two 741 operational...
Electronic Thermostat (CB17276E)
This circuit can use NTCs from 200 to 680 ohms, just change P2. For 200 ohms use 330 ohms, for 250...
Wattmeter (CB24172E)
This circuit is from a Radio Electronics magazine from December 1971. The resistors are power...