CIRCUIT ALLOWS SLEW RATE CONTROL
This circuit (figure 1) will impose a maximum slew rate on a signal; positive and negative rates can be independently controlled. The circuit is useful in servo applications where the error signal needs to be limited to be within the power rails to ensure predictable operation.
Read more original source:
http://freespace.virgin.net/ljmayes.mal/pubs/slew.htm
Categories: Electronic Control, Motor controller Tags: motor control, Servo Circuit, Slew Rate Limit
Manual Servo Control by PIC16F84
Our next program will allow you to control the direction of the servo manually via a SPDT switch (with a center-off position) connected to ports B1 and B2. Without a center-off position, you will have to use two switches. A schematic is shown in figure 3 (below).
Read more original source:
http://www.imagesco.com/articles/picservo/03.html
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DC motor runs off of calculator solar cell in dim light
How do we achive 10nA operation? By using diodes in place of pull up resistors, and by isolating the DC load from the trigger circuit via junction drops and the 10nF capacitor. If there is too much power comming from the solar cell then the motor might run too often or even continuously. You can avoid this by putting a 100K ohm resistor in series with the solar cell.
Read more original source: http://members.shaw.ca/novotill/SolarPoweredMotor/index.htm
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