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Save 50 - 555 Circuits : zip (1.9MB ... - Talking …
www.talkingelectronics.com2 - 1N4148 signal diodes 2 - BC547 transistors 1 - BC557 transistor 1 - 555 timer chip 1 - 8 pin IC socket 1 - red LED 1 - green LED 1 - orange LED