I have a lightly used 16K RAM module for the Timex Sinclair 1000 including the box and all.. if he'd like to sidestep the issue, I'd be happy to sell it as I could use the money and my Sinclair (as mentioned above) is quite useless to me.
Hi,
Sorry but yesterday was unable to connect to the internet due the Hurricane Earl, So I have no internet connection, I'm connected right now in the public hot spot.
Here is my findings:
1. Was replace all capacitors in the circuit with brand new and same value, also replace the transistor, but the problem persist, the transistor become very hot.
2. The voltage in the emitter is about 8.95V and same in the base, and 12V Output source = 8.69V
3. Cut the trace that supply 12V to the RAMs and the 12V Output source fix, but the transistor become very hot.
4. Take out the Transistor and measure is: 10.02V in emitter place and 0V in Base and collector place.
I very confuse right now.
Any help.
Thanks
The 12V is probably just the output of the nominal 9V supply so it doesn't really tell you much about the switcher; what's the actual measured voltage of the 9V supply? DC or AC?The measure in both side of the resistor is -5.02 and -7.1 V but in some seconds the voltage drop to 0 in both side.
I measure all diodes and all are ok.
Why the other member has different transistor? 2N6727 bigger transistor
Thanks
The measure in both side of the resistor is -5.02 and -7.1 V but in some seconds the voltage drop to 0 in both side.
I measure all diodes and all are ok.
Why the other member has different transistor? 2N6727 bigger transistor
Thanks
Yeah, that's what I suggested, assuming he can't sort out the power supply problems and especially if the RAM chips have been damaged in the process, but I think you might need an additional IC or two to decode chip select; isn't there a schematic for that on the web somewhere?Rather than doing such an intrusive modification to the T/S 1016, a 1.5x2.5 inch board with the edge connector on a short ribbon cable and a point to point wired 32K SRAM pulled from a 486 cache would use only 5V, draw little power, and provide twice as much RAM. In fact, 32K is the max you can add to a T/S 1000 if I'm remembering correctly.