Working voltage: 4.0-7.0V

PCB size: 28mm (length) * 25mm (width)

Kit speaker: 8 ohm 0.25W

Kit list (delivery list):

Component name Quantity (pieces)

PCB board 1

8 ohm 0.25W speaker 1

100MM red thread 2

100MM black thread 2

NE555 chip 1

8P IC holder 1

100UF 25V capacitor 1

10UF 25V capacitor 1

6*6*5 button 1

103 ceramic capacitor 3

47K resistor 5

1N41482

DIY parts are shipped without drawings and actual pictures:

The color of the PCB board may vary due to different batches. Please understand that the board is made of high-quality FR4-A fiberglass board. Each PCB board has been tested by flying probe before leaving the factory. The PCB board is made of FR-4 military grade A material. The tolerance of the board and the stability of some parameters. The A material performs very well. This is beneficial to the high price compared to some other sheets. The parameters of the components are directly printed on the PCB, so you can solder them directly without referring to the circuit diagram, which is quite convenient.

FR4-A plate features:

1. It is not prone to self-deformation bending (referring to bending caused by non-human forces). Poor boards will occur with time and environmental changes.

bending.

2. The impedance is more stable and reliable;