Direct Coupled On/Off Touch Switch

The following touch switch circuit uses a CA3240 dual BiMOS op amp to sense small currents flowing between the contact points on a touch plate. Since this circuit is directly coupled with line voltage, a 1 M resistors in series with the touch plates is employed  to ensure user safety, avoiding hazardous high voltage shock. This high resistor values is […]

Read more

Extending 555 Timer’s Delay with Integrator

555 IC is very popular component for timer circuit. With integrator circuit, we can extend the timing period of 555IC timer with reasonable capacitor size. With conventional 555IC timer configuration, the timing capacitor will be large compared to integrator version. You can see the comparison in the graph below the schematic diagram. [Circuit’s schematic diagram source: seekic.com]

Read more
1 3 4 5 6 7 47