This is quite a common power supply, a lot of the simple breadboard power supplies available on Ebay are based on this kind of design. Many of the parts are …

The ICL7660 is another one of these very useful little IC’s to have in your collection, The ICL7660 is a monolithic, CMOS switched-capacitor voltage converters that can invert, double, divide, or …

The LM380 is a power audio amplifier for consumer application. There are 2 versions an 8 pin DIP package and a 14 pin package where pins 3, 4 , 5 …

The LM386 is  a low voltage audio power amplifier. It is suitable for battery-powered devices such as radios, guitar amplifiers, and hobbyist projects. This comes in a 8 pin dual …

This is a simple circuit that was submitted, the purpose was to check the voltage of a golf cart battery that was not in use did not fall below a …

This is another basic circuit using a transistor, you can use this as a noise source for testing an amplifier for example. Schematics   Parts List   QTY PART-REFS VALUE …

This is a simple logic probe based around a transistor A Logic low will switch the LED off A logic high will switch the LED on Schematic   Parts List …

This is a basic amplifier example using a transistor, you adjust RV1 to get the best results. You can get around about a gain of 50 (Vout/Vin) Schematic

Resistors in series Example 1 is 2 resistors in series In this example the total resistance (RT) = R1 + R2. So in the example above its 10k + 10k …

A bounceless switch example using a 7404 inverter.