High impedance differential amplifier (CB20641E)

This circuit is from Texas Instruments documentation from the 1980s. The operatinal ones are from the era and the power supply must be symmetrical.

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1kHz Triggered Oscillator 555 (CB25513E)
We found this circuit in the October 1992 Radio Electronics magazine. The frequency is given by C1...
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1-cycle-per-30-day oscillator (CB26073E)
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