Power amplifier electronic circuits-tube audio rf amplifiers

Electronic Amplifier Circuits-Power amplifier, audio amplifier designs and circuits

May 27th, 2010

Simple 7-Segment Counter Circuit

Circuit Description

The circuit diagram of 7 segment counter circuit has been published here. This circuit consists of counter IC CD 4033 as its central part, timer IC NE 555 and 7 segment display LT 543. In this circuit, the timer IC NE 555 acts as astable multivubrator circuit to produce square wave pulse output. This pulse output is used to trigger the counter IC CD 4033. The count of counter increases by one for each pulse. The counter output is displayed through the seven segment LED display LT543.

Circuit Diagram

Simple 7-Segment Counter Circuit

Simple 7-Segment Counter Circuit

Notes

  • Use a good quality PCB to assemble this circuit.
  • This circuit can be used in conjunction with various circuits where a counter to display the progress¬†gives more attraction.
  • Switch S1 is used to initiate the counting.
  • Diode D1 prevents the risk of accidental polarity reversal.
May 27th, 2010

Train Horn Circuit

Circuit Description

The circuit diagram of dual tone train horn circuit has been described here. Here in this circuit, the core part is the timer IC NE 556. This NE 556 IC is the combination package of two NE 555 timers that work independently. Here the push button switch S1 is used to start the horn. A 9V DC power supply or battery is used here for powering this circuit.

Circuit Diagram

Train Horn Circuit

Train Horn Circuit

Notes

  • Use a good quality PCB or common board to assemble this circuit. Constructing a bread board prototype is recommended.
  • In this circuit, two NE 555 timers connected in cascade can be used instead of NE 556.
  • This circuit is simple and low cost but works greatly.

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