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| Inexpensive Huntron 2000 Design (Possibly using DSO138 Kit)? |
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| Chris56000:
Hi! The prices being asked for old Huntron 2000 Component Trackers, even "parts only" ones, have now gone up into the bloody stratosphere, which, given the manual with schematic is freely available online, led me to further thoughts:– 1) Whilst I've not yet tried seeing if I can extract the 87C52 dump from my employer's unit, whose CRT is approaching the end of it's useful life, would it be too difficult to program a Nano or PIC to read the button functions of a Huntron 2000 and provide switch/pwm outputs for the H2000's analogue circuitry, if Huntron have set the 87C52's lock bit? 2) Is the DSO138 JYE Oscilloscope Kit with TFT fast enough in response to be used as a display in lieu of a CRT (saving the need for a CRT with the associated high–tension voltage supplies it would need!), and if so, will it run in x/y mode? 3) If this is feasible, can a larger size TFT module be fitted to the DSO 138 kit or does this require code alterations? If members can look at my idea and point me in the direction of code libraries/Arduino tutorials I'd be very grateful! Is there a "GitHub" repo for the DSO138? Chris Williams |
| Gyro:
--- Quote ---3) If this is feasible, can a larger size TFT module be fitted to the DSO 138 kit or does this require code alterations? --- End quote --- I remember seeing a thread on bigger displays in the JYE DSO138 forum... https://jyetech.com/forum/viewforum.php?f=18&sid=f7b11da47f69d3b4c26a35306f5d1741 |
| Chris56000:
Hi! A quick update on this thread and another question - I've just been looking at the Huntron 2000 Maintenance Manual and there's no Micro Dump to worry about - the instrument is entirely discrete CMOS logic operated with no micro in it - I must have been looking at the manual for a different model! However, on the circuit diagram (Page 90, Huntron Front Panel Schematic, Huntron Page Ref 6.3):- https://s3.amazonaws.com/Icarus/DOCUMENTS/HUNTRON_Manuals_1771.pdf . . .can anyone tell me what an "RZ Taper" is, as referred to next to R8, "RATE ADJ." control please, and would I be able to get one? Chris Williams |
| tsman:
--- Quote from: Chris56000 on March 02, 2019, 04:24:28 pm ---. . .can anyone tell me what an "RZ Taper" is, as referred to next to R8, "RATE ADJ." control please --- End quote --- Reverse log taper on the potentiometer. Might be hard to find a 1M reverse log pot though... https://www.digikey.com/products/en/potentiometers-variable-resistors/rotary-potentiometers-rheostats/84?k=&pkeyword=&sv=0&pv1=37&sf=1&FV=ffe00054%2C11100004&quantity=&ColumnSort=0&page=1&pageSize=25 |
| Chris56000:
Hi! I've now found several Reverse log 1M pots from ebay and other sources, can anyone suggest wether the transformer kit here:- https://www.ebay.co.uk/itm/171950796418 . . .would be suitable for making the signal voltage transformer shown in the circuit-extract attached? The primary would be driven about 24-28V pk-pk from a modern replacement (cheap eBay P.A. D.I.Y. kit) to the LM759 used here, and the secondary would be 10, 20, 40 & 60V RMS at frequencies of 50, 400 & 2000Hz. The maximum power into the primary I estimate at 8W under s/c conditions, much less with normal good components. The transformer needs to provide about 150mA RMS current o/p on the lowest voltage tap, 25mA on the others., what wire-gauge would be suggested and where can I find design resources for such a transformer? Chris Williams PS! My training & experience is in repair, this is the first time I've ventured into winding small transformers for new projects! |
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