Circuit Project Electronic

Using inexpensive components, you can fit a simple probe circuit into a pencil-sized enclosure. When both LEDs are on, the probe indicates the presence of an ac voltage; either LED alone indicates the presence and polarity of a dc voltage. The diode-bridge arrangement allows one-way current source R1, R2, Q1, and Q2 to light either [...]

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 [...]

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 [...]