Ladder Generator (CB9104E)

Found in General Electric documentation from the 1970s, this circuit generates a staircase signal.

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4mA at 20 mA Generator XTR115 and PGA309 (CB15571E)
The presented circuit is suggested by Texas Instruments (www.ti.com) in its Application Report...
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Simple 1-transistor oscillator (CB23615E)
This circuit takes advantage of the inductance of the coil of a high-impedance phone to form the...