Free electronic circuit design and schematic diagram
Programming old EPROM devices needs high voltage, and this is a circuit of high repetition rate Vpp programming supplies. This circuit is used for memory programming that need higher repetition rate. This circuit produces the Vpp continuously by the switching regulator that runs continuously. To preclude any possibility of inadvertent Vpp output, the switching regulator mus t be turned of […]
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This is a Basic Flash Memory Programming Voltage Supply circuit. This circuit uses LT1072 switching regulator to generate high voltage by driving the L1. R2 and R2 provide DC feedback for this circuit. R3-C2 and C1 control the SC roll-off. This circuit can generate supply of 12V or 12.75V depended on the R1 values. To protect this circuit from the […]
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This is a compressor circuit that can be used for dynamic mic, condenser mic, or electric guitar pickup. This circuit doesn’t produce very good sound output, but it has very stable amplitude/volume. This compressor circuit design is unique since it uses base current control for manipulating the gain. Here is the schematic diagram of the circuit: The first and second […]
Read moreThis is a aircraft band receiver video. This video shows step by step how to modify the transistor radio so that the radio can receive the transmission radio from the air traffic control tower. Normally, to pick up the transmission radio from the air traffic control tower, the special radio or scanner. This video uses FM transistor radio. First the […]
Read moreThis is a video about how to hack the 12V battery. Using the 12V battery, the $40 can be saved. First, pull the case of the battery using screwdriver and pulling the back. You will find the eight 1.5V cell battery. The cell batteries that hacked from 12V battery can be used to power six devices. Here is the video:
Read moreThis is a 9V battery hack video. This video explain how to hack the 9V battery and uses it for other devices. First, using pliers, open the chasing of the battery. It’s nothing dangerous inside the battery. There are six small batteries inside the 9V battery. Actually, this small batteries are the quadruple batteries. Each battery has 1.5V. These batteries […]
Read moreThis is a video about free hidden electricity. This video discover the secret source of electricity that the power company and phone company hide. To discover this secret source, we need a phone line. Every phone line has between 40 to 7 volts. Beside that, to uses this secret source, we need two resistor, a regulator and bridge rectifier. In […]
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