brarmanini

Hello All,

Over the last few weeks I have been tinkering with an Asiatam recoil/ elevation unit install into my HL Panzer IV with converting a short barrel model to a long barrel. For the recoil / elevation installation I relied on the follow Asiatam Recoil / Elevation Unit installation thread found here.
[link]http://www.rcuniverse.com/forum/m_10033386/anchors_10102909/mpage_1/key_/anchor/tm.htm#10102909[/link]

The install took me a little longer than I wanted because of the new mantel machining and also trying to fit Tamiya electronics into the hull with all the required components; just last week I finally found a supplier that carries the crimps that go into the wire from the recoil unit to the tamiya pcb header. Got everything installed and was off testing the recoil in action.

When I tested the recoil, I got no action. I verified the tamiya electronics were hooked up properly. I checked the voltages coming from the tamiya electronics, 3.3v on positive, 3.3v on trigger with a transient to 0V when triggered and of course the ground. I verified I was getting these voltages at the recoil motor. With no action with the recoil connected to barrel, I disassembled the recoil to just running the motor. Again no action on the recoil motor with no spring or gears connected to the recoil motor.

I disconnected the recoil wiring from the mfu and connecting the wires directly to a 6v battery, the recoil worked perfectly. I added in some resistors inline with the motor to get the voltage drop down on the motor to 3v to replicate the nonworking recoil. Well with any extra resistance the recoil would not work.

One other note is that the barrel slides extremely easily in the mantel.

So has anybody gotten the tamiya electronics to work the the Asiatam recoil? If so, how did you overcome the power issue to drive the recoil motor.

I figure my only options here are to use a direct connection to the battery with the trigger coming off the tamiya electronics with an optically isolated relay, or some form of darlington transistor (opto is preferred to protect the tamiya electronics).

Thanks for all your help in advance.

Bret