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REACTION TIMER USING NE555

March 29, 2017

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TL496 3 to 9 volt converter Circuit Diagram

This is simple Simple TL496 3 to 9 volt converter Circuit Diagram . it uses the TL496 power supply controller, a coil and a electrolytic capacitor. The maximum output voltage is actually 8.6V and current is around 80mA.The input current (the current drawn from the batteries) is 405mA at the maximum output current. Without load the current consumption is 125µA and the batteries life is around 166 days. TL496 3 to 9 volt converter Circuit Diagram

500mW PLL FM transmitter 88 108MHz

Circuit diagram 500mW FM PLL transmitter 88-108MHz This PLL transmitter is controlled and the frequency is very stable and can be programmed digitally. Transmitter will work 88-108 MHz and output power up to 500mW . With a small change can set the frequency of 50-150 MHz . The output power is often set to several watts with transistors. So therefore I decided to build a simple transmitter with great performances. The frequency of this transmitter can easily be changed by software and space / compress air coil. This transmitter is the oscillator colpitts. Oscillator is a VCO (voltage controlled oscillator) which is set by the PLL circuit and PIC micro controller. This oscillator is called the Colpitts oscillator and voltage controlled to achieve the FM (frequency modulation) and PLL control. T1 must be HF transistors to work well, but in this case I use a cheap and common BC817 transistor. LC tank oscillator needs to oscillate properly. In this case the LC tank consists of L1 with t...

How to Build a Fox Hunt Transmitter

It is a very Simple Build a Fox Hunt Transmitter. This 2 meter 144 MHz fox hunt transmitter is used in amateur competitions where a hidden transmitter is to be “hunted” using mostly home brewed receivers and antennas. The foxhunt electronic circuit is the transmitter. It radiates a high quality signal without unwanted harmonics. Transistor T1 and the crystal together make the oscillator that generates a 36MHz signal. The unwanted 12MHz basic frequency of the oscillator is suppressed by the filter circuit made of L1, C3, C2. The L2/C4 circuit is set to the fourth harmonic or 144 MHz. The signal goes to the dual-gate-FET driver stage before finally radiating through the transmitting antenna. The output power is from 10…40mW. The radiated signal is also modulated by the gate circuit made of U1, U2, U3, U4. Gate U1 is a low frequency oscillator which generates a signal from 0.1 to 0.5Hz. This signal modulates the transmitter through the transistor T3. Fox Hunt Transmitter Circuit D iagram ...

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REACTION TIMER USING NE555

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