This package contains the schematic for an FM transmitter with 3 to 3.5 W output power, and can be used between 90 and 110 Mhz. Although the stability Although the stability isn't so bad, a PLL can be used on this circuit. This is a circuit that I've build a few years ago for a friend, who used it in combination with the BLY88 amplifier to obtain 20 W output power (for that schematic, get the LINBLY88.EXE file). From the notes that I made at the original schematic, it worked fine with a SWR of 1 : 1.05 (quite normal at my place with my antenna). He didn't use it for stereo broadcasting, but that shouldn't be a problem. BTW: I'm sorry about the mess my OrCAD Annotate made of the component numbers. 2) Components/Hints I don't have a PCB-layout for it, but as I remember I've made it on a normal RF-testing breadboard (with one side copper). Make some connections between the two sides. Build the transmitter in a RF-proof casing, use good connectors and cable, make a shielding between the different stages, and be aware of all the other RF-rules of building. Q1 and Q5 should be cooled with a heatsink. The case-pin of Q4 should be grounded. Adjustments: C24 is for the frequency adjustment. The other trimmers must be adjusted to maximum output power with minimum SWR and input current.

Schematic drawn using OrCAD Capture, which is straight out of the datasheet of the flyback controller LT3748. This is a class project and we must build our own transformer. We couldn`t get the bobbin we wanted and so decided to just lay down the transformer somewhere next to the board and connected it through a 4-pin connector. We couldn`t really mimic the layout

I needed an excuse to use the soldering iron so I figured that I might as well as make a frequency counter which is something that I`ve always wanted, but lacked in my lab. Here`s the schematic. I drew it up in OrCAD PSpice a while back. Since then, I have lost the design files, but fortunately, I kept a hard copy, complete with annotations of the colour of the wire that I used for some of the confusing control logic.