直流电动机控制电路-DC Motor Control Circuit

Notes:
 Here, S1 and S2 are normally open , push to close, press button switches.  The diodes can be  red or green and are there only to indicate direction. You may need to alter the TIP31 transistors  depending on the motor being used. Remember, running under load draws more current.  This  circuit was built to operate a small motor used for opening and closing a pair of curtains. As an  advantage over automatic closing and opening systems, you have control of how much, or how  little light to let into a room.  The four diodes surriunding the motor, are back EMF diodes. They  are chosen to suit the motor. For a 12V motor drawing 1amp under load, I use 1N4001 diodes.

低功耗闪烁器电路--Low power blink led

R1 = 4 mOhm D1 = Red Led 5mm   
R2,6 = 10 mOhm T1 = BS170   
R3 = 470 Ohm T2 = BC560B  
R4 = 10 kOhm   T3 =   BC516   
p5 = 680 KOhm
P1 = 5 MOhm
C1 = 22n   
C2 = 220n