CRE 8900 OVERHEATING MODIFICATION
if you do not want to do this mod then do not buy any radios made by CRE

If you are here reading this then you may have had the same problems that I had with my CRE 8900 CB radio getting very hot, in fact mine got that hot it burnt out the TIP 36c transistor & the radio stopped working. So I replaced it & the other transistors & voltage regulator, why, well they were all bolted to the same bit of aluminium that the TIP 36c was bolted to, so that they could be damaged as well, the cost about £6.00 for the lot. Below is the inside my radio, you can see that I have removed the transistor TIP 36c & soldered 3 wires (yellow/red/black) to the board.

image of inside the rig

Here you can see I have soldered the transistor onto the wires & mounted it at the back of the radio using one of the heat sink mounting screws, you will need to to put some heat sink grease between the transsistor & the heat sink.

image of inside the rig

The fan was fitted before I did this mod. it is controled by a thermostat that came from eBay (see last two pictures) top right you can see the temperture probe, it is held on by two cable ties. Before I moved the TIP 36c transistor I had the probe inside the radio next to the TIP 36c, the temperture after 25/30 minutes used to be about 80/95c, the trouble is that there is no where for the heat to go & the top left hand side of the radio used to get very very hot, CRE even put a warnning sticker on case saying CAUTION THIS SURFACE MAY BE HOT. I then after moving the TIP 36c I fitted the probe to the heat sink where it is now & the temp used to get to about 50/60c with the fan running, & it would cool down when the radio was not being used, but the right hand side of the radio still got hot, not as hot it did before I moved the TIP 36c. I then got thinking about the 8 voltage regulator in the radio, do I need to to suppy the radio with 13.8v ? so I set the radio output to 6 watts by keying up & put a amp meter in the line & it showed 5.1 amps, I then turned down the voltage (I have a adjustable power supply) & keeping the mic keyed & at 10.4v the output of the radio & the amps started to drop, so I turned it up again to 10.6v the amps went up to 5.1 amps & the output went up to 6 watts. The heat sink at the back now dose not go above 40c, with the fan running & without the running it only gets to about 55c & the right hand side barely gets warm. I done few tests on SSB & it all seems to be OK. Conclusion is if the TIP 36c is moved & the voltage is dropped down to around 10.6v this radio will now work fine with or with out a fan, & just because the voltage has been dopped it doesn't mean that the radio can't get out, even at the lower voltage it still puts out the same amount of watts & draws the same current one last thing you mite have to alter the battery under voltage setting in the radio using the usb cable & software

image of fan

Cobra HG m75 that I have modified with the three buttons chnnel up/channel down & auto squelch control (ASC). I have also done the internal mod's found here.

image of mic

One other mod. that I have done is to replace the battery with a 9v regulator, & conected it to pin 6 on the radio, it was 12v out but now 10.6v if you have been following the above. I have wiring details of how to fit the up/down/ASC buttons to the cobra mic & how to wire it for the cre 8900, if you need this plaese use the contact button at the bottom of this page

image of mic

Below are LED thermostats control boards mounted in between some Perspex sheet.

image of meter

image of meter