4-digit Up-Down counter with PIC 16F88 This is a 4 digit decimal counter which can operate as a free running counter or in count and hold mode with manual reset. In either mode the counter can be preset to count to a specified value. Clock edge and leading zero suppression can also be configured. The 7-segment display and indicator LEDs are multiplexed….

0-99 Two Digit Counter By IC 74LS48 , 74LS90 This is circuit 0-99 Two Digital Counter.
use IC TTL Digital IC 74LS48 x 2 to LED 7 segment Display, and 74LS90 x 2 for Decade and Binary Counters.
Input Clock pin 14 from IC 74LS90. Here is circuit use power supply 5V.

UP DOWN counter circuit by CD40110 This is the circuit diagram of a very simple up down counter that can be used of a large number of applications. The circuit is based on the IC CD40110BE which is a CMOS decade up/down counter. For ICs are used here. Common cathode seven segment display is connected to the 7-segment output of each IC.Display connected to the IC1 represents the lowest number and display connected to IC4 represents the largest …

Digital Circuit Testing This is Logic Digital Tester Circuit. It uses the level input about 5V and use the integrated circuit LM324. Be Main Part electronics …

Logic Digital Tester by LM324 This is Logic Digital Tester Circuit. It uses the level input about 5V and use the integrated circuit LM324. Be Main Part electronics perform Drive All LED. Then use Current very low about 10mA by have potentiometer be formed fine the value threshold give just right with the level logic digital both of 3 the level that use by LED1(Green)….

Test Transistor in Circuit by IC 4011 This circuit to Test Transistor in Circuit (PCB) Easy to use. It use IC 4011 or CD4011 or MC14011 or TC4011 , very low cost. Supply volt 9V…….