Hey everyone. Like most of you who own Microsizers I'm sick of the crappy range these things get. So I thought I'd try a few things out to improve this. First thing I tried was the telescopic antenna mod. No luck, range was still crap. I looked for the infamous "cripple capacitor", didn't find one (to be honest I didn't look too hard
).
Sooooo, I thought I'd do what I do best and is mod the beast!.
After a fair bit of research I found that you could isolate the power to the TX2 chip on the controller whilst upping the power to the RF amp to increase range. For added functionality I isolated the charging circuit as well back down to 3 volts so I wouldn't blow my nice new RX-7 Microsizer.
From the datasheet for the
TX2/RX2 chipset the maximum voltage that the chip in the transmitter can handle is 5V. So I isolated this using a 78L05 (L for low power) voltage regulator to stop it from blowing up when putting 9V to it!
This is all theory at the moment. I hope to build this on the weekend so I will provide pics and posibly video to backup my findings.
For now though here is my circuit which is the original TOMY circuit modified as explained above.
Cheers,
ph2t.
Threaded Mode
