Most of them are components used in the
NRD-xxx series or in my own designsSome easy found, some very hard to find, now all together over here!
| A collection of a few hardware PDF's. Most of them are components used in the NRD-xxx series or in my own designsSome easy found, some very hard to find, now all together over here! |
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| Component code | Information where used in the circuit | ||
|---|---|---|---|
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uPD5101L NEC version |
Very old, very low power cmos-RAM, used in the NDH-518 Has only 256 - 4 bit locations! Very hard to get for repair because due to it's 256 locations it has become rather useless. | ||
2101 National HM-6501 Harris HM-6551 Harris HM-6551 Intersil HM-6561 Harris NMC6551 National MCM5101 Motorola MWS5101 Intersil CDP1822 Intersil NTE65101 NTE TC5501 Toshiba |
Functional look alikes of the CMOS RAM above 2101 is only suitable to test the circuit, it is NOT suitable for battery backup, it is NMOS and consumes so much energy your backup is empty within the hour. The MCM5101, HM435101, S5101 (AMI), MWS5101, TC5501 and NTE65101 are identical. CMOS 4721B, MM74C920 and CDP1822 will probably work also. The HM-6501, HM-6551, HM-6561, NMC6551 although, are a fully equivalent low power RAM for battery backup Save and keep them if you find them in scrap | ||
PDF link Diagram sketch of a replacement module for in an uPD5101 socket |
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HB1 relay NAIS - MATSUSHITA NR-HD relay |
HB1E-DC12V used all through the NRD-515 Not only used in the attenuator circuit, also in VFO-control (INT - EXT) NR-HD-5V used in the NDH-518 memory unit. | ||
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MB3712 in Japanese ROHM ECG1423 |
Very hard to find audio output amp in NRD-515 This is the pdf in Japanese scanned from a service booklet I found an equivalent circuit ECG1423 and cleaned the PDF | ||
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TA7140P in Japanese Toshiba TA7140P |
Audio buffer and pre-amp in NRD-515 Scanned from the same Japanese booklet And finaly I found the Toshiba datasheet, crippled, so I also cleaned it. | ||
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ZN426 Ferranti |
Old 256 step R-array D/A converter. Used in my auto BC-tune circuit for the NRD-515 Unfortunately no longer available........, see next item | ||
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AD557 AD558 Analog Devices |
Also an old 256 step R-array D/A converter. Used in my second version auto BC-tune circuit for the NRD-515 This D/A converter is still available, both can be used! | ||
|
uPB426 NEC |
Programmable bitmap array ( Bipolar TTL Prom ). Used to decode the input filter bank out of the display information.
If this device is blown you have "shot yourself in the foot"! You cannot buy it programmed, nor who will program it for you?? Solution, see next item. |
|
22V10 Lattice datasheet first set of files to make the 22V10 second set of files to make the 22V10 Manual sheet in PDF with information how to build the re-wire socket |
A self-made solution for the uPB426 above With a double pin re-wire socket in between a GAL 22V10 will work if the uPB426 gets blown. Smaller GAL's like the 16V8 and 20V8 have not enough product terms per macrocel. Keep in mind: This GAL device has to be programmed too! Put the *.JED file in your GAL-programmer. Tested and works great! The first (early) version had a lot of don't cares, so I tried to make a better version. It was not easy possible to fit it in a smaller GAL ( 20V8 ), so the result is a different approach with a second version for a 22V10 It still could be possible with a 20V8 with fixed wiring for D3 and using its macrocel as a node. And a different re-wire socket. But the repair is already finished. It worked OK with a 22V10.
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uA723 Philips LM723 National LM723 SGS-Thomson MC1723C Motorola |
Some variations of the well known 723 Old, but very universal voltage regulator Used as an extra regulator for each VFO. | ||
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MC4044 NEW !! version MC4044 Original Motorola !! |
This is NOT a standard CMOS circuit! Very special phase frequency detector ( PLL ) originally made by Motorola Used in the synth circuit of the NRD-515 Very hard to get for repair from the original manufacturer. That's why it is new on the market by a second source: Agere Systems!. | ||
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U310 FET Siliconix - Calogic |
Well known VHF FET used in the NRD-515 in balanced mixer configuration U310 is the metal version, in plastic known as J310. | ||
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MC1350 Motorola |
Well known IF chip used in the NRD-515 in the synth part | ||
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1N34A 1S1588 1SS315 1SV149 1SV100 BB212 |
Some diodes used in the NRD-515 or their equivalents 1SS315 as a replacement for 1S2187 1SV149 as a replacement for 1SV100 at last the real 1SV100 PDF BB212 is a duo-version used in some BC-TUNE upgrade's | ||
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M5236ML M5237ML Mitsubishi |
Some special circuits used in the NRD-525 and NRD-535 in the power supply | ||
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M5218AL M5223L Mitsubishi |
Some special OpAmps used in the NRD-525 and NRD-535 However...: M5218AL is compatibel with 4558 and M5237ML is compatibel with 358 | ||
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SN76514 Texas Instruments SN16913P |
Two mixer circuits used not only in the NRD-525 and NRD-535, the SN76514 is even used in the Yeasu FRG7!! Found at last! A pdf under a new component name ( TL442C ) - but exactly the same circuit Also a simple self made PDF for the SN16913P | ||
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HD10551 Hitachi |
A special prescaler used in many synth circuits | ||
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"Not found yet" Corner |
LR3671D - magnetic encoder interface chip NRD-535 and NRD-525 CX7925B - PLL chip NRD-535 SN16913P - Another mixer circuit old FC-xx varicap datasheets Old Toshiba databook to scan the old TA- and TC-xxxx stuff The same could be said for old ROHM, SHARP LA-xxxx, FUJITSU MB-xxx stuff |
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| pdf515.htm by Walter - PE1ABR - 2011-10-10 |
