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In this Electronic Circuit Project , a 74HC14 hex Schmitt trigger inverter is used as a square wave oscillator to drive a small signal transistor in a class C amplifier configuration. The oscillator frequency can be either fixed by a crystal or made adjustable (VFO) with a capacitor/resistor combination. A 100pF capacitor is used in place of the crystal for VFO operation. Amplitude modulation is accomplished with a second transistor that controls the DC voltage to the output stage. The modulator stage is biased so that half the supply voltage or 6 volts is applied to the output stage with no modulation. The output stage is tuned and matched to the antenna with a standard variable 30-365 pF capacitor. Approximately 20 milliamps of current will flow in the antenna lead (at frequencies near the top of the band) when the output stage is optimally tuned to the oscillator frequency. Micro Power AM Broadcast Transmitter Circuit Diagram: A small 'grain of wheat' lamp is used to indicat

Modifying USB OTG Cable - Mini USB - micro This is a very simple way to change the standart USB to USB OTG. The Mini or Micro USB to USB does not work if you want to use it for OTG, because 4. pin micro USB plug is not plugged. Connect as shown above.

Here is simple Electronic circuit project of 5 volt micropower regulator circuit. This micro power 5 volts DC regulator can be designed using few operational amplifiers and some other electronic parts. 5 Volt Micro-Power Regulator Circuit Diagram:   This 5 volt regulator is ideal for instrumentation requiring good power efficiency . Maximum load current is 10 mA , and can be increased by changing Q1 to a power transistor and proportionally increasing the set current of A2. This circuit accepts a wide input voltage range between 6.5 volt and 30 volts. Low power 3 terminal IC regulators typically draw 2mA to 5mA quiescent current compared to only 50uA with this discrete implementation.