| Brand | Unbranded |
|---|---|
| Marke | Markenlos |
Check the listing for details. DC4.5V NE555 Pulse Motor Speed Controller Kit DIY Electronic Technology Practice. Condition: New. Listed at 2.57 USD. D1 is used to prevent the power connection from damaging JE555, D2, C1, R1, R2, w1, 1C1 to form a pulse generator with adjustable pulse width. D3 and C5 eliminate the Counter-electromotive force generated by the motor to protect the triode.