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One should not continue the experiment with a radio transmitter with >2km range as it is risky and polluting the radio dial of community.. if your frequency or ghost signals is somewhere over a particular local FM radio station then you are at high risk!
Don't forget that these cheap simple transmitters have harmonics which interfere with TV and police, ambulance and fire department communications.One should not continue the experiment with a radio transmitter with >2km range as it is risky and polluting the radio dial of community.. if your frequency or ghost signals is somewhere over a particular local FM radio station then you are at high risk!
Are you talking about the TL499 IC that was used in the Australian project?u r talking about obsolete parts audioguru.
Here is a very simple boost using transistor and 555 timer. If you want 9V out, just change to a 9V zener on the output. With 3V input, you can get 9V out at about 12 mA.ronv,i want use only transistors if possible,@colin i have already posted a circuit.
ppl,
i need a 3V to 9v converter circuit for my new project, so i want know and learn about them, can anyone post a schematic that is easy to build? I got a 3.7V battery with 750mA current and want 9v or 12V out of it
9v SUPPLY FROM 3V
You can replace a 9v battery with this circuit.
The output is about 10.4v on no load and 9.6v @30mA .
The advantage is the voltage stays over 9v for the life of the cells.
A normal 9v battery drops to 7v very quickly.
The output voltage is set to 9-10v by the 6k8 and 390R resistors. The 470R gives the circuit an idling current of about 20mA and the spikes are about 75mV.
By increasing the 470R, the quiescent current decreases but the voltage drops more when the current is 30mA.
**broken link removed**
It is a certain type of a fairly high frequency ferrite core.but what is F29 material?