Published:2009-7-13 4:55:00 Author:May | From:SeekIC
Circuit makes current through linear pot a Iinear function of rotational angle of pot. Article gives design equations. Current i1 through R1 is used to charge C, which is periodically discharged by UJT when trigger voltage is reached. Frequency of output sawtooth is proportional to i1 and hence to angle of rotation of pots. To set up, adjust pots to give maximum sawtooth frequency and ad just preset R5 for re-quired maximum frequency. Set pots to other extreme and reset R3 for required minimum frequency. -A. Armit, Linear Current/Rotation Control, Wireless World, Dec. 1975, p 576.
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