这是个经典555应用电路，具有触摸可调定时功能。该电路已经得到广泛应用，低成本、可靠的性能，特别适合初学者制作的电路。-This is a classic application circuit 555, with a touch adjustable timer. The circuit has been widely used, low-cost, reliable performance, especially for beginners make the circuit.