Servos - working principle and homemade types
Channel: HomoFaciens
Date: 2013-10-14

Table Of Content:
00:00 Introduction
01:19 Torque and servo speed
02:25 Sensor (potentiometer)
02:56 Driving a servo by PWM
04:15 Hard stops
04:48 Servo driver circuit
06:17 Self made servo board
06:39 PWM signal to DC voltage (low-pass)
09:02 2. order low-pass
10:18 Amplifying the DC voltage
10:59 Controlling the H bridge
11:38 Comparator
12:50 Window comparator
15:04 Connecting and adjusting the servo board
18:30 Powering the servo motor
19:15 Ripple of the PWM signal and motor control
20:02 Homemade servos
20:24 CD tray as servo
20:59 Servo composed of a hreaded bar
21:25 Limitations
22:22 Higher transmission is better
22:57 Voltage fluctuations
23:27 Digital control
24:11 "Hacking" servos
25:21 Driving "hacked" servos
26:19 Examples of use
27:36 Power H bridge with modified servo board
28:26 Signal sequence at the electric motor
29:44 Comparators between servo board and H bridge
31:13 Using the modified servo board
33:15 Windscreen wiper motor as servo
34:32 Digital control of servos

The project page about servos with circuit layouts:
http://www.homofaciens.de/technics-base-circuits-servos_en_navion.htm