Figure 1 and Figure 2 is produced by 555 when the base circuit of the double bonds with one-touch touch touch switch delay switch. M1 in Figure 1 is "on" touch piece, when the staff touched, the body sensors add to the clutter signal is triggered when the base circuit of the low end of the IC pin, the circuit is set, pin output high, pull the relay K is energized, its normally open contacts closed, charged with electrical power work. M2 is "off" touch piece, once touched, the noise signal added to the human body sensor 555 threshold end IC, reset circuit, pin output low, loss of power tripping relay, was charged with electrical appliances stop working.

Figure 2 is a delay switch circuit, 555 Manifold connected as one-shot, usually in a reset state, the relay K is not action. When M was touched, the circuit is triggered into the transient, pin output high, the relay pull-K, was charged with electrical work. Transient time t = 1.1R2 X C4, transient time has elapsed, the circuit turn into a steady state, the relay K release, was charged with electrical appliances stop working.

Figure 3 is a power circuit to a specially designed circuit with 555 produced by the touch switch, it is only two outside-out, so you can directly replace ordinary switch without having to change power supply wiring. EL is less than 25W incandescent or contactor. Left part of the general lighting dashed line, right side of the touch switch circuit. IC is in reset state, pin output low, VS thyristor gate through the resistor R3 is clamped low, so the shutdown VS, EL does not shine, the work of 555 at this time by the 220V AC power supply via light EL, rectifier diode VD1 ~ VD4, current limiting resistor R2, VD5 IC1 filter regulator and the operating voltage of about 6V DC power supply. When the 555 feet by the time base circuit  When the trigger is set, IC  pin output high, VS open, EL light shine. VS opened, the power supply 555 directly from the light EL, diode VD1 ~ VD4, VS thyristor circuit with the regulator VD5 form, C1 can still get both ends of 6V DC voltage, resistance R2 does not work only at this time.

The right side of the circuit when the base part of the circuit in Figure 1, the same as the left part of Figure 2, the power changes in Figure 3, it can easily be made into an external delay of only two pinout touch switch. One thing to note is the required load capacity of the circuit is VD1 ~ VD4, VS and VD5 joint decision, in which the weak links VD5, the circuit VD5 with 1W, 6V regulator, the maximum on-state current of 0.16 A, to ensure the reliable operation of the circuit, EL suitably no more than 25W incandescent.

Figure 4 is produced by two-D touch trigger switch. CD4013 is a dual D flip-flop, respectively, then as a one-shot circuit and a bistable circuit. The role of the monostable circuit is a pulse width of the touch signal shaping to ensure that each touches are reliable. Bistable circuit to drive thyristor VS. When the staff touch the M, the body leakage of AC voltage drop across the resistor R2, the positive half cycle signal into feet CP1 side to make the turn into the transient one-shot circuit. That its output Q1 goes high foot jump, the high charge by R3 to C1, so potential to rise, when up to reset the level, the one-shot circuit is reset, low foot recovery. Therefore, every touch a M, pin to output a fixed-width positive pulse. This positive pulse will be directly added to the 11 foot CP2 side to make a bistable flip the circuit, the output level of Q2, or 13 feet to change again. When the 13 pin is high. VS opened, EL lamp lit. At this time the voltage across the capacitor C3 will drop to around 3V, the LED VD6 off, due to the micro-power characteristics of CMOS circuits, so the manifold can still work. When the 13 pin output low. VS loss trigger current, when the AC zero crossing that off, EL extinguished. At this time the voltage across C3 regulator has returned to VD5 value 12V, VD6 LED to indicate switch position. Thus, every touch a M, can achieve the light "on" or "off", it is only two outside-out, it is very easy to install and use.
Figure 5 is a musical doorbell with a chip made of KD-9300 touch switch, circuit new and interesting. It is clever use of the doorbell circuit chip features, the leakage current through the body to control the bistable flip-flop chip. We know that music has a very high input impedance integrated circuit, when the staff touched "on" electrode M1, the body leakage current injected by the R1 trigger the end of the chip's doorbell TR1, the bistable flip-flop flip chip to show the whole bell-chip low resistance, transistor VT1 turn, relay K pull, often open contact turns the Beikong appliances. Need to turn off electrical appliances, just touch the "off" electrode M2, the body leakage current through R2 injection chip Vss terminal, forcing the bistable flip-flop within Manifold flip again, so that the whole chip is now high resistance, VT into the cut-off state, K loss of power release, was charged with electrical power.

To ensure safety, connect the touch electrode resistance not less than 4.7MO high quality metal film resistor with high resistance.