We will try the PIC microcontroller 2 led flasher circuit using PIC16F627.
Because like this circuit Which we can set ON-OFF of both LEDs for easy, long and accurate.
This circuit is a variable time base oscillator circuit that has operation as high frequency pulse oscillator generator out to a Decade counter circuit.
This non-contact ac voltage detector circuit, using digital IC CD4060 as main components and resistor and LED display only. it is use 9V battery as power supply.
Digital logarithmic sweep signal generator circuit
Digital logarithmic sweep signal generator circuit by use average digital, It is designed to use together with frequency generator by voltage controller. [...]
Simple crystal oscillator 1-10MHz using inverter gate
This Simple Crystal oscillator Circuit using 74LS04 that provided square wave of 1MHz to 10MHz, Use inverter gate IC and control frequencies with crystal [...]