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Old 13th July 2019, 07:36 PM   #11
djn is offline djn  United States
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I found this Hewlett Packard 608e V.H.F signal generator for a good price. Would it work for my amps?

The bench has really good built in lighting and I have a laser thermometer.
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Old 13th July 2019, 07:41 PM   #12
rayma is offline rayma  United States
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Quote:
Originally Posted by djn View Post
I found this Hewlett Packard 608e V.H.F signal generator for
a good price. Would it work for my amps?
That generator starts at 10MHz.
http://hparchive.com/Manuals/HP-608E-608F-Manual.pdf
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Old 13th July 2019, 07:50 PM   #13
djn is offline djn  United States
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Ah, so looking for stuff that works under 40khz? I'm also seeing a lot of power supplies. What volt and amps would be good. My current amp project tube heater takes 20v and 3A each tube.
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Old 13th July 2019, 07:56 PM   #14
rayma is offline rayma  United States
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Originally Posted by djn View Post
Ah, so looking for stuff that works under 40khz? I'm also seeing a lot
of power supplies. What volt and amps would be good. My current amp project
tube heater takes 20v and 3A each tube.
A typical supply would have 30-50VDC at 3-5A. I would get either two singles, or a dual with
tracking and strapping options for series or parallel. Current limiting is a good feature to have.
The filament supply could be a laptop switcher.
HLG-60H-20A: MEAN WELL : 20V 3A 60W Class 2 Enclosed Switching Power Supply Outputs Adjustable by Internal Pot : Power Supplies & Wall Adapters

Last edited by rayma; 13th July 2019 at 08:02 PM.
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Old 13th July 2019, 11:43 PM   #15
djn is offline djn  United States
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I talked to the guy that is selling the HP 608 and he said he had a bunch of stuff the would work for audio. I went to his place and got this for 5 bucks and a 3 hour lesson on how most of this stuff works. Had a great time.
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Old 13th July 2019, 11:47 PM   #16
djn is offline djn  United States
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Old 13th July 2019, 11:47 PM   #17
rayma is offline rayma  United States
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Originally Posted by djn View Post
I went to his place and got this for 5 bucks and a 3 hour
lesson on how most of this stuff works.
I used to have one of those, it's old school, but ok.
Good enough for troubleshooting and general testing.
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Old 13th July 2019, 11:49 PM   #18
phredrick is offline phredrick
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Originally Posted by nigelwright7557 View Post
One of the best things I have bought.
Instead of burning my fingers checking temperatures I can point my laser at it and read off the screen.
I took it a step further and have an infrared camera now. I won’t claim they are cheap but can build one on a raspberry pi.

For the OP, I second the power supply suggestion...with current and volt limiting. A couple are nice so component power and signal voltages can be set without fiddling around. Lots of options out there on cheapish imports.

I sort of laugh at myself for the things I used to do to get DC power...and now I just flip a switch and turn a knob or two.

Last edited by phredrick; 14th July 2019 at 12:10 AM.
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Old 14th July 2019, 12:24 AM   #19
1audio is offline 1audio  United States
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need help with new workbench
I have been using the LED strip lights (like they sell for kitchens) under the lowest shelf on my bench for several years. They have worked OK but not really enough light. Recently I was lucky enough to get some high bay type lighting (like you find in a big box retailer), all LED, however they are expensive and I'm now using 500W worth of LED lighting in the shop. I can see everything but its really too much. I get between 600 and 1500 lux in the shop. For working on the latest fine pitch stuff it seems essential. I would target that light level at a working location (similar to surgical work). FWIW my phone using GPSstatus reads almost the same as my luxmeter. I am also convinced I needed a lot less light 30 years ago to do the same work. Also be sure to arrange the lighting so you are not in the way of your lighting.
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Old 14th July 2019, 12:40 AM   #20
nigelwright7557 is offline nigelwright7557  United Kingdom
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I find an LED angle poise lamp best for electronic bench work.
It sits just a few inches above the pcb I am working on and puts out loads of light.
The room has a very bright LED mains lamp anyway so that helps.

The only problem with the LED angle poise lamp is the radiation from it sometimes gets into a pcb and interferes with signals.
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