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This circuit is wealthy in harmonics and is good for testing amplifier circuits. to seek out a fault in an amplifier, connect the planet clip to the 0v rail and move through each stage, beginning at the speaker. a rise in volume ought to be heard at every preceding stage. This Injector will bear the IF stages of radios and FM sound sections in TV's. to Index

This circuit is  good for finding component causing incidence trouble voice at radio-set of receiver. Have been realized that in this time a lot of radiation of broadcaster which cannot be arrested by radio receiver limpidly. Sometime - sometime original voice lose to be swallowed  trouble - other voice trouble . So long as in installation each every real correct component, circuit will function properly . Besides can be used for look for the source of voice trouble . This appliance can be made to look for trouble at radio receiver which  not sound at all . Part List : R1=220K R2=4K7 Vr1=100K Vr1=100K C1=10pF C2=1uF C3=1uF L1=100R D1=OA70 Q1=BC327 Q2=TIP42C S1=Switch On/of G1=6V battery Tp=Test Pad SP=Speaker connector To determine the level of interference , then the required injector which is connected with one leg and foot trimpot polar + diode crystal. To be more easier then made the switch as circuit above, the switch is derived from the meeting  trimpot legs t...

Here is a Low-cost Electronic Circuit Project of Flashing Signal Alarm with LEDs Circuit. Flash signals for the AO-543 modules are derived form the fast- and slow flash outputs. The fast flash signal is generated by a oscillator circuit.A LED  flashing briefly once every 5 seconds to imitate the indicator of a real alarm is the function of this dummy alarm project with the use of a 7555 timer IC.This circuit is useful if you need a low-energy flashing alarm. Low-cost Flashing Signal Alarm with LEDs Circuit Diagram: The 200 to 400-dc supply should have enough internal resistance to charge the 0.5 capacitor between flashes, about 2 or 3 time constants, which means about 500 kQ to 1 for a 1-s rate.Use lower values for higher rates.The Signalalarmfunction shall cause the system to generate a SIGALRM signal for the process after the number of realtime seconds specified bysecondshave elapsed. Processor scheduling delays may prevent the process from handling the signal as soon as it is ge...