openrcforums

2N2222 or 2N3904 are general purpose low power NPN silicon bipolar junction transistors. They are ubiquitous and also very handy to have around. Yes, either can work fine in this case but you need to change the circuit slightly. There are 2 choices: 1/ provide enough base current such that the BJT i...

IRF510 is pretty chunky for such a low power application. Have you considered fleabay? You can find 2n7000 shipped to your door from USA seller (i.e. fast) for $4 ( link ). Maybe more parts than you need, but awfully handy to have some general purpose low power n-channel enhanced mosfets laying arou...

yes Showmaster, many many options.... If one wanted to stay away from switched buck converters because of electrical noise concerns, here's a $2 neatly packaged 3.3V linear regulator that can handle a wide range of input voltage. A fully charged LiFe @ ~12.4V is pushing it a little according to AMS1...

@KCFlyer, you're right - I screwed up on the hexbug motor voltage; sorry 'bout that. I edited my post 5 up from here. The Hexbug uses an LR44 / AG13 battery which is a 1.5V alkaline. Those batts die about 1.0V. If you are going to use a hexbug motor in your 9x, you should either rig up a 2n3904 or e...

KCFlyer, I think you'll find answers to most of your questions above in this thread. Also a search in the forum shows many variations on where people have mounted the motor. From what I can see, anywhere on the plastic case interior seems to work fine. Hot-glue or epoxy it in so the vibe is well tra...

Found this programmer on fleebay. Interested because it claims no drivers needed for Win7_64bit - must have USB handshake built into onboard Atmega8 firmware? Anyone tried it, what settings are recommended in eepe or companion9x? http://i1163.photobucket.com/albums/q557/yanghaitao/1-24.jpg http://i1...

I've scoured the forums and the wiki and couldn't find this file anywhere. Maybe useful? Thought I'd post here and see where it should be stored (if not already...)

haha, yeah a big deal over little motors! I think we're doing the right thing by considering current draw, feedback amplitude, circuit design etc. I've scoured the web and can find 2 basic types of vibro motors: pancake style and cylinder motor style . Pancake motors all seem to take 3V nominal, hav...

ShowMaster, I can understand you wanting to use 2 motors to up the haptic amplitude. This will definitely be hard on some linear regulators. I propose an alternate 5Vdc source; a switched buck converter like this or this ? Switched buck converter is more efficient and can deliver more power than lin...

kinda... First link is to PDF of V1 OEM. This is already posted on this forum. Second link to a KiCAD SCH (in PDF format) of part of V2. It's only the mobo. This could be useful because could take the original .SCH file and modify it to make complete V2. I found that same info and original KiCAD SCH...

Hi all, I've been scouring the web and cannot find schematics for the 9x OEM V2 board. Checked FCC website, the latest TH9X filing from May 2012 (FCCID=N4ZFLYSKYTH9X) has schematics listed as permanently confidential ; they are not posted. Before I start from scratch attempting to create the schemat...

maybe that should be my positive contribution to the wiki - translate and upload the V2 schema. This Xmas I hope to get a new 9x radio (Santa you heard that, right?) and with KiCad I could attempt to document it. Thinking will create a new forum topic to poll who might have a head start in this rega...

kilrah, thanks for setting me straight. Does anyone have a link to the latest V2 schematic? Google can't seem to find it anywhere. To summarize, the 7805 on the mainboard only powers the micro. Batt is fed to the switchboard, which itself has a 7805 for the buzzer (and this haptic mod). Switched bat...

hmmm, according to schematics , on top left pg5 there is a single 7805 which provides 5V to micro and other subsystems. On top left pg1 there is 5V feeding 2 more linear regs which create 3.3V and 2.5V for RF subsystem. I.e. from what I can tell there is only one 7805 that powers everything. Is ther...

Showmaster, that latest circuit/explanation you sent looks good. You're using the FET the right way and current draw is reduced to (hopefully) fit into the MC7805 current budget. Just 1 word of warning...the only problem with pushing that 7805 is if it does trip due to overcurrent/overtemp, then the...

Awesome, Thx ShowMaster! If I read your description correctly, your circuit looks like this? 9x haptic r2.png 2 motors in parallel seems like a lot of current draw for the 7805. All the pancakes I found online say ~90mA current each. I wonder how much this circuit draws and how much abuse the 7805 i...

has anyone fabbed a low voltage cutoff circuit for their receiver to prevent this from happening? I know you wouldn't want that accidentally happening during a session, but if you set the voltage low enough you could prevent (major) damage to the battery and not impact Tx on time or critical flight ...

new here, please go easy on me! Here's what I was thinking for the haptic only circuit. Feed pin43 into the gate of 2N7000 (N-ch enhanced MOSFET), tie a 4k resistor from gate to ground to drain the gate when not activated. From 5V source, drop the voltage down to ~3V using forward voltage characteri...