Schematics / Serge Positive Slew
Serge Positive Slew ,more information on a classic Serge modules as well as PCB's at http://www.cgs.synth.net/
From the page dedicated to the Serge Positive Slew http://www.cgs.synth.net/modules/cgs83_positive_slew.html the following short description :
This module is a variation on the 1973 Classic Serge Positive Slew module. It is a forerunner to the popular Dual Universal Slope Generator. It is presented here for those who want to build themselves a classic Serge. There are two Positive Slew modules on the PCB. It can be used as both a rising slew rate controller, or a upwards sloping ramp LFO by hooking the lower pulse out into the Start input. In this configuration it also operates as a utility oscillator, suitable for fixed key sequencing and general sound effects and noise making. It is not suitable for tracking a keyboard.