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Make that a 2k that I placed across R3468. That makes it pretty close to 953-ohms. I need to stop relying on my memory... Barry - N4BUQ

Greetings to all members of the group. Well, I'm not an expert in electronics; I would say I'm a humble enthusiast. That's why I come to you to request your help. A few years ago, I bought a TDS744A

Yes, the Farnell L30 series, very popular in the UK, have an internal diode across the regulator in their 5A version, so they're absolutely fine with being back-fed. But oddly the 2A and 1A variants

In theory, you want a four quadrant power supply, one the both sinks and sources current.? An alternate name is an SMU (Source Measurement Unit) which may be designed to be a bit of overkill. I'd

I have a bridge on a heatsink with banana plug for the supply and red and black binding posts I use for any charging. I keep it near the supply. Safety precaution. Peter

Are there any types of lab power supplies that will inherently survive back feeding from a battery if the line power fails, or you just turn it off the wrong way? Yes, I can always use a diode to

Always be careful charging batteries from power supplies.? I have seen quite a few get destroyed if there is a power failure and are backfed by the battery.? If you are unsure and don't want to risk

Lots of options mentioned already. I will throw out the Korad KA3305P linear supply for consideration. Decent quality, Chinesium price. Three channels, but one is dedicated 5v so doesn't really

Can someone please tell me where I can find the details regarding MOD3089 for a 7704A? I was perusing one of the PDF scans of the service manual and notice there are several mods that seem to relate

Thanks Jared. Duly noted. Yesterday I measured on J1400: +15: +15.06 +5: +4.69 -5.1: -4.93 -15: -15.08 Ripple is less than 5mV. I cleaned the boards prudently (ipa, brush & comp air). The PSU is

Hi Jim, Yes, it is a robust design. Both designs use auto-sensed incremental Transformer tap ranges to provide an intelligent I-V SOA for the design. The 6603D (Dual 60V 3A), I purchased before I

Don't bother buying a manual, head to Tekwiki where I've uploaded everything I can find for these scopes. https://w140.com/tekwiki/wiki/TDS520 You'll only need to replace the VCO board if the two

Awesome glad to hear the 284 is back up and pulsing. Zen

The 10 turn pot is a good way to side step the need for dual (coarse and fine) pots. I used to have (20+ years ago) an ancient vacuum tube dual power supply with 10 turn pots, but to avoid moving that

Got a Topward PS myself but don't recall the model number.? It does have an issue with the master side not working, but I don't know how it was treated by its previous owner.? Also, the red

Adam, Well done! Now on to the next project…….. Shaun M.

An even number, and I hope to never use tweezers on that TD again. There was nothing wrong with the 284 except the coarse bias control and dirty slide switch contacts. I also note that I screwed up

Hi Adam, Nice that your pulse output is OK now! Remains the key question: did you change the orientation of the TD an odd or an even number of times? Perhaps there was nothing wrong at all with the

Thanks to you both. Yes my intention was to: Buy the manual Measure the psus Desolder and take notes of caps data. Clean the boards. I will indeed put them in the dishwasher Jared. I would not have

My Type 284 now has a working pulse, and my sincere thanks to all who have helped with this problem! One lesson learned (maybe): start checking signal levels versus the manual before taking stuff