#2 transistor fm transmitter how to#
#2 transistor fm transmitter portable#

I’m not encouraging anyone to broadcast illegally- I just want to ease anyone’s fears about playing with this kind of low power circuit. Of course none of us will ever get legitimate licenses, but that’s a small price to pay. There was eventually a police raid, equipment seizure and a few arrests after a new group took over the station and got very cocky and radical, but basically, if we stayed low key they didn’t go out of their way to haul us to jail or fine us. Our dealings with the FCC were mostly limited to knocks on the door from agents asking to inspect the equipment, a polite refusal to let them in and them leaving to get a warrant while we packed up the gear and went to the next available space. My experience was with a 24 hour pirate FM station with a broadcast radius of 3-4 miles. While the verbiage sounds scary, the ‘enforcement’ is pretty soft. I’m here in Florida, the pirate radio capitol of North America.

#2 transistor fm transmitter portable#

Posted in Portable Audio Hacks, Radio Hacks Tagged FM broadcasting, fm transmitter Post navigation

#2 transistor fm transmitter how to#

While its 10 component count is impressive, it can’t beat this 3 component FM transmitter we shared a year ago! Stick around after the break to see how to make your very own. In fact, it gives “floating ground” a whole new meaning! Besides being an extremely easy way to make a PCB without any fancy tools, it also makes you think about circuits in a different light. It’s unique in that instead of using traces it uses one copper PCB which is used for all ground connections, and then small islands of the same PCB glued on top to form nodes for the circuit to connect to. The method shown here is one of the easiest to build, and it’s called the Manhattan Style - the same method used when built his BITX radio. Originally designed by the Japanese multimedia artist, this simple FM transmitter can be built with only 10 components and about an hour of your time. The inherent problem with this type of circuit diagram transmitter is that any external load (antenna) will change the operating frequency.Making your own FM radio is practically a rite of passage for hackers. The frequency determining elements (L1, C5 and C6) form a simple LC tuned oscillator.

Use the cutoff from a resistor leg.Īntenna length for circuit diagram transmitter varies with frequency for optimum distance: 90MHz 80 cm, 95MHz 75cm, 100MHz 70 cm, 105 MHz 68 cm. This gives you a greater range, but at the expense of frequency stability.Īll component leads should be kept as short as possible. Tap A (10%) delivers very much more power (around 10mW) to the antenna load. The output level (around 2.5mW) and range are therefore somewhat reduced.

Tap B (2.5%) takes just a very small portion of signal from the oscillator circuit and therefore gives a very frequency stable transmitter. These are both low-level outputs and you choose which tapping you want to use ( stable low range, or more unstable but higher range). The tuned coil L1, has two output tapping for the antenna connection, marked 'A' and 'B'. This fm transmitter circuit needs to be powered from a 9 volts battery or from another 9 volts regulated power supply. This fm transmitter circuit is a very simple and require few external components and operates in FM band above 100 MHz.