Two transistor and coil Oscillator

148

02:03:30

This oscillator uses a 2N3904 NPN, a        2N3906 PNP, a 27 mH coil , 9 volt lamp, resistors as shown.........................................

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This oscillator flashes at about 1Hz ,
I built it and it is flashing right now as I look at it.
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In real it doesn't spike like the simulation does. Shake it..............

published 9 years ago

nikisalli

9 years ago

How do you built a 27 mH coil ? Because i need coils but on

nikisalli

9 years ago

Inductor calculators it says i need like 200turns with a diameter of 18centimetres and it's too big for a small circuit board

nikisalli

9 years ago

I'm talking about a 10mH coil

ferlop

9 years ago

Hey nikisally, I had two 27 mH coils factory made, there is no brand on them. The number is LH327. I have an inductance meter and that helps when making coils, they sell these meters on ebay they are not to expensive and based on an atmel chip, link below:............................................ .............. http://www.ebay.com/itm/LCR-T4-ESR-Meter-Transistor-Tester-Diode-Triode-Capacitance-SCR-Inductance-New-/321694553340?hash=item4ae67d54fc

ferlop

9 years ago

Sorry Nikisalli.

nikisalli

9 years ago

Ok thank you 😃

ferlop

9 years ago

Not a problem. :)

ferlop

9 years ago

Experimented with this circuit, I removed the coil and turned power on it started flashing without the coil........... .............................................................It works in real two transistors and a lamp, simplest yet oscillator, it does not work within EC, it has to have the coil. That was disappointing.

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