The transistor used in this circuit is uncommon today. AC124 or equivalent such as AC188K and 2N2431 can be used. The circuit is from the 80's and makes use of transformers.
The 4047 is a monostable/astable CMOS multivibrator. The basic con- figuration is triggered by the...
January 2017 - The new MAX14001 and MAX14002 analog to digital converters from Maxim can now be...
An OR gate can be improvised using NAND gates of a 4001 as shown here. The diodes are...