Electronic schematics, circuit designs
CB - FM receiver, simple 27MHz fm receiver
This is a simple FM-CB receiver built with TCA440 for listening CB ( citizen’s band ) transmissions with FM ( frequency modulation ).
CB-FM receiver circuit schematic design:
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1Hz generator and 2Hertz oscillator
This 1 Hz and 2Hz generator or oscillator is built with 4060 as an oscillator and a 14 bits counter. To obtain a 1Hz signal after 4060 we use 1/2 4013. This circuit provides a rectangular voltage with a amplitude between 0V and the power supply voltage.
To adjust this 1Hz generator connect to pin 9 a frequency meter and adjust C2 untill shows 32,768KHz.
The 1Hz / 2Hz quartz generator / oscillator schematic:
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50V 2A power supply circuit design - adjustable
LM10 makes this 50V power supply a quality one. With 2 LM10 we can build a short circuit protected power supply, with adjustable output voltage and current.
The output voltage increases linear with P1 and P3 adjust the current. P2 is used for adjusting the maximum output current (2A). This 50V power supply has a minimum output voltage arround 0.4V and maximum 45V. For 50V the main transformer is 42V / 2A, C5 = 4700uF / 80V, T4 = BF257, T6, T7 = BD245B . R12 has 470Ω / 5W.
If a short circuit appears the final transistor wont burn if are cooled enough.
50V power supply schematic design:
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