INPUT : enter the process name : aaa enter the processing time : 4 enter the process name : bbb enter the processing time : 3 enter the process name : ccc enter the processing time : 2 enter the process name : ddd enter the processing time : 5 enter the process name : [...]
digital+clock+schematics
Here’s a simple home alarm circuit is for those who are eager to know the concept of home security system. It consists of three 555 timers gets the input from a contact that could be connected to a motion detector or any momentary contact that monitors a certain process. Once the contact is momentarily closed, [...]
Here’s a fire alarm circuit using LDR (Light Depending Resistor) as light sensor. It warns the user against fire accidents. It relies on the smoke that is produced in the event of a fire. When this smoke passes between a LED and an LDR, the amount of light falling on the LDR decreases. This causes [...]
RF Power Amplifier for QRP with low cost. This circuit is a broadband one from 1.8 to 30 MHz, so it is “no-tune” and you need only to regulate the quiescent current bias multiturn trimmer of each Mosfets couple. This means also low efficiency (for a lower IMD it is even low as around 20-30%) [...]
Short notes about Circuit troubleshooting. – Check the circuit for mechanical failures, like disconnected wire, broken vias on the board, and connections between two adjacent vias which are not to be connected. – You should compare values of components and their connections with values and connections between components on the schematic. – Measuring DC voltages [...]
