Sight n sound metronome


Posted on Mar 31, 2013

Precise, adjustable control of beats per minute from a largo of 18 to a frenzied, high presto of 500, These beats are produced acoustically through a speaker. A light flashes at the same rate. When SW1 is closed, CI begins to charge through Rl and R2. Cl will eventually reach a voltage at which the emitter of unijunction transistor is switched on, `dumping` the energy stored in Cl into an 8 ohm speaker. To produce a distinct `plop`, brief pulses across T2 secondary drive Q2 into conduction


Sight n sound metronome
Click here to download the full size of the above Circuit.

The extra gain of Q3 and Q4 are sufficient to briefly switch LI on, then o£f; as the pulse wave pas-ses. Capacitor C2 "stretches" the puise slightly to overcome the thermal inertia of the lamp, so that a bright flash occurs,.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Ultra-Flanger guitar effect
    Keypad Combination Lock circuit
    90Vrms voltage regulator
    Variable-slope-compressor-expander
    Make circuit of the inverter and operating principle by oneself
    Make the laser harp of the intention by oneself
    electronic toggle switch no1
    connection tester schematics
    pic raymarine seatalk bus interface
    Luminescent Generator
    Capacitive Dimmer switch circuit



    Top