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.
