Tone Generator Circuit using 2N4891
This be Basic Tone Generator by UJT Transistor 2N4891 numbers. By it s can give with small-sized loudspeaker s have a voice electric loud bell moderately. The value of C1 be valuable a little for enhance the speed in the package and disgorge to load. In each round (Cycle) that get be sound frequency at shine depart a loudspeaker. By can fine sound frequency get with R2 – 100K the value Resistance low tall frequency. But if the value is Resistance the tall low voice frequency. This circuit has can to develop next again. Request enjoy something sound electric bell …
Ramp  Generator circuit using  2N4891 FET
This be Ramp Wave Generator Circuit by use UJT , 2N4891 numbers are important equipment. By Q2 take Voltage of C1 and give Output be sawtooth waves . The R3 will control occurrence waves sawtooth rate by signal picture has will the character is waves , the alms is Voltage quietly increase until sawtooth picture until be high class Voltage topmost that about 5.4V by use power supply Voltage 9V. I hopes this circuit may is born the advantage and friends. Related Links More circuit about signal generator More circuit about Waveform Generator More circuit about Ramp Generator Squarewave Oscillator …
Cricket  Generator  circuit using 2N4891
This circuit gives sound handful that modifies interestedly, occurrence sound rate cricket Fixed. By R3 should experience change the value C1,R5 and C2 effective that differently. A loudspeaker that use should is model Piezo Tweeter. The Transistor use get many the number. but that use Q1,Q2 be 2N4891 numbers or the number replaces. For power supply source use 9V. Detail other sizes see in the circuit request friends have fun Cricket Generator Circuit. Related Links American Police Car Siren by IC 555 Red Alert Startrek Alarm by IC 555 Water Activated Alarm by IC 555 British Police Car Siren by …
AC Dimmer for Lamp 6.3V
This the circuit AC dimmer low voltage For lamp 6V. While this friends may don’t see the advantage of this circuit. But I thinks first step advantage be something get learn the work of Triac. And have tall safety , because of use AC Low Voltage. Which the work is simple be The UJT Q1 will do the frequency give Triac work or make Lamp the bright. By have work rate of Triac can control with R1 or Be something dimmer there. You will may apply with the size Voltage the other all right. The Q1 use UJT – 2N4891 …