The complete circuit diagram for the simple Games Timer is shown in Figure below.Essentially, it comprises one building block based on a single 555 timer IC (integrated circuit), wired as a monostable. The circuit produces an audio alarm after a preset time delay. Circuit Working Push switch … [Read more...]
This project will be useful to check the output of your USB device like computers USB port etc.The green LED will indicate whether it is working or not.It will be useful to have it in your mini lab or hobbyists garage. Components Needed : The PCB - you ca make PCB on your own by method … [Read more...]
Going camping nowadays involves taking lots of electronic equipment whether for day to day running or for fun and entertainment. Most of the time a charged leadacid battery and a power inverter would be used to ensure a smoothly organised holiday where ideally the missus and the children cheerfully … [Read more...]
This project lets you conveniently connect any computer with USB ports directly to a simple, traditional connector the 9-pin RS-232,It converts the electrical signals from a USB<–>serial TLL convertor to the RS-232 standard. So in a nutshell,it converts a USB port into a standard but basic … [Read more...]
Although radios are common enough and cheap, why not make your own from a few readily available components? For example, the design shown in Fig is uncomplicated thanks to the two integrated circuits, IC1 and IC2, and it will receive radio stations transmitting amplitude modulated (AM) radio … [Read more...]
We are now going to create a set of traffic lights that will change from green to red, via amber, and back again, after a set length of time using the 4-state system. This project could be used on a model railway to make a set of working traffic lights or for a childs toy town.we have connected 3 … [Read more...]
The photo shows an arrangement for supplying power to a white LED. The maximum distance for which the LED still emits any light with this arrangement is quite large: 1.3 m. The power transmitter uses the same push-pull circuit as the 10-watt halogen lamp supply inset. The transmit coil (transformer … [Read more...]
It is not intended to be used as an alternative to medically approved hearing aids. This simple design consists of a microphone and a three-stage transistor amplifier. It has a manual volume control and is powered by a 9V PP3 battery. Its circuit diagram is shown in Fig.. The microphone (MIC1) is a … [Read more...]
We can increase the voltage gain still further by connecting two similar circuits as shown in Fig.. This will provide a significant increase in the gain, enabling an electronic switch, for example, to be controlled by quite low sound levels. … [Read more...]
With recent advances in semiconductor technology, the maximumluminous intensity of red l.e.d.s has increased to several candelas. Now consider that human flesh is translucent to red light. Combine these two facts, and we have the basis for the present project. The average cheek has a … [Read more...]