Sine to square converter (CB7329E)

Using a 555 this circuit was found in old documentation, but it is still valid.

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741 Timer Up To 10 Minutes (CB1270E)
This timer with 1 second accuracy was obtained in a 1973 documentation. The Buzzer is a low-power type...
Temperature indicator (CB9308E)
The sensors in this circuit are NTCs and PTCs that work in a differential way by directly...
4mA to 20 mA Generator with the XTR115 and PGA309 (CB12534E)
The presented circuit is suggested by Texas Instruments (www.ti.com) in its Application Report...