Posts Tagged ‘electronic test equipment’

Morse Buzzer Alarm or Continuity Tester by IC 4011

This circuit uses the integrated circuit CMOS number IC 4011 pretend Square Wave Oscillator , which touch buffer change output (which compose Complementary pair of transistors) for a loudspeaker next by bass keen in the sound can control with potentiometer or 10 K ohm when we wasp the circuit suits power supply as a result , be , sound generator get , and in other words we can use to are Continuity Tester by use probe 2 reach instead of itch knock the password there. In addition Input pin , that still no use of , gate CMOS every a pin join with negative supply for feed prevent all noise.

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Checking Transistor with the sound

This circuit uses to check transistor get accurately and fast. By the way will check to tell with sound signal which , pertaining to the expansion ratio of transistor. Then help reduce the expenses in tool expensive buying. The transformer T1 in a picture is model output transformer at use prevent general in the receiver transistor the general. With regard to have consuming trend low make use battery 9V get long moderately ago. The royal utensils is model use 8ohm loudspeakers. And usability have S1 do infront on-off and choose a kind NPN and PNP of transistor for S2 use press when want to check each time. Friends can see the detail adds in the circuit yes.

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Voltage Sensitive Oscillator by 2N4891

When Voltage of , Battery desperately will know get with this circuit. It is Voltage Sensitive Oscillator Circuit. By use pillar equipment be UJT 2N4891 equipment numbers are a little. A friend may like. By this circuit will beep alarm generator. When Vin be valuable lower Vz of D1. For the level Turn- OFF that want. The circuit will warn when Voltage of Battery be valuable lower the location keeps example easy accident and is the circuit that are valuable good please sir.

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