Pazzy

This is a wireless microphone circuit which transmits the FM frequency and uses a coil on the printed circuit board itself. This transmitter has a good frequency stability, its sensitivity is excellent and audio consumption is about 30mA. The size of the PCI board is 25mm by 50mm.The power supply is made ​​by a 9V battery. and its range can be more than 100 meters.  FM Wireless Microphone with Coil PCI Circuit Diagram To improve the transfer transistor 2N2222 use in place of BC547.You have to remove the 4K7 resistor if you use a dynamic type microphone. Sourced By: www.streampowers.blogspot.com

I received the Boozhound Labs JFET Moving Coil (MC) Pre-Preamp Kit a while back and I promptly assembled the small circuit board. I’m a sucker for a simple kit and a hot iron. That is where it all stopped. The circuit board remained complete and laying about for a few years. Recently I required another MC stage because the tube moving-magnet (MM) preamp I had just completed did not work all that well with the Jean Hiraga MC stage I had been using for years. It appeared the Hiraga had too much output and was over-driving the tube stage. So I needed another MC stage. [ ]

This is a wireless microphone circuit which transmits the FM frequency and uses a coil on the printed circuit board itself. This transmitter has a good frequency stability, its sensitivity is excellent and audio consumption is about 30mA. The size of the PCI board is 25mm by 50mm.The power supply is made ​​by a 9V battery. and its range can be more than 100 meters.  FM Wireless Microphone with Coil PCI Circuit Diagram To improve the transfer transistor 2N2222 use in place of BC547.You have to remove the 4K7 resistor if you use a dynamic type microphone.

  Automotive Ignition Coil Buzz Box Circuit Diagram :   This picture is a circuit for a buzz coil using a standard car battery to create. Dual timer IC 556 is used to set the frequency and the duty cycle of the coil current to be determined. One of the timer is used as an oscillator for generating the rectangular waveform 200 Hz to control (IRF740 MOSFET), while the second timer is stopped and the oscillator switching points are opened and closed (closed = a). The result is a steady stream of sparks of the ignition coil a distance of about 5 milliseconds, while the switching points are closed. Operation: Pin 8 and 12 the trigger inputs, and a timer which are driven by the points and an inverted signal of the clock output (pin 9) to produce. When the pin 9 is grounded points high, and vice versa. The signal on pin 9 controls the reset line (pin 4) of the second timer and keeps the output at pin 5 is low, while pin 4 and pin 8 is low and 12 high (still open). The 15K and 47K resist...