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EPROM eraser

(16)
Sure do you have any old programmers laying around? I've been hording up 74 series logic ic's and any Eproms I can get my hands on too if you have any of them
mark hubrich
16
posts
1:01 PM

Ultrasonic circuit from hell (long)

(25)
... OV protection controller MC3423. Dave
DaveC
25
posts
Jun 28

Measuring hv & hf?

(4)
Turns out that I have a unique Tek scope, the 222PS. This has 600vac input capacity, x10 probes (theyÆre proprietary connectors to the scope), and 500v/div
DaveC
4
posts
Jun 27

Basic hv question

(12)
A basic meter "movement", weather it be mechanical or electronic, is usually a very sensitive device. It will have a certain amount of internal resistance and
Paul Alciatore
12
posts
Jun 27

I need help help help

(7)
Check out this place and maybe call them. http://www.monsterguts.com/store/ Hope that helps, schemer
Dave
7
posts
Jun 25

What cap is this?

(15)
Actually, the line did indicate that that lead was connected to the foil that was nearest to the outside foil of the capacitor. This was so that that lead
Cougercat
15
posts
Jun 25

34063 Buck regulator with Built-in diode?

(3)
Yes Richard, it is exactly the same as an MC34063A but with the marking HH34063. The circuit is the same as others I have used with the MC34063 with the
lilacbarn
3
posts
Jun 21

Alkaline battery (cell) life

(6)
... There are corner cases of devices that actually do require near-new battery voltage or they will stop functioning. I communicated with a bloke who says
DaveC
6
posts
Jun 19

High V drop on rectifier

(10)
High voltage rectifiers for CRT TVs and monitors would have 6 or more diodes in series, so you had to test them with a suitable resistor, 9V battery, and
alienrelics
10
posts
Jun 17

Matching NPN transistors

(8)
It's also possible that the transistors don't need matching, but were merely hand-selected for some particular characteristic. I have had to service some
Andy
8
posts
Jun 14

Identify this diode?

(3)
I can't confirm, but I think the "DII" might be a Diodes, Inc. identifier or logo. Maybe an older one? http://www.surplussalespa.com/catalog/images/1N5817.jpg
Andy
3
posts
Jun 12

how to wire new switched outlet

(19)
Is this European 220 wiring or US 120? Red and black are the 220-240 volt residential colors to indicate the two hot conductors.White is the neutral.Green or
npublici
19
posts
Jun 11

what is considered AC ?

(8)
... The names pulsating, direct, variable and alternating shown in the figure in the upper right corner of the page
Howard Hansen
8
posts
Jun 4

Source for LED indicators?

(3)
... Ha! Can you imagine productivity after the first time this sign lights? Drunk forklift drivers? The mind boggles... ... ThatÆs what IÆm looking for, sort
DaveC
3
posts
Jun 4

June Circuit cellar Challenge

(6)
Hello Andy, Where did you see a deadline 13 days ago for the June challenge. The link I posted shows the deadline is June 20, 2015. The other Howard
Howard Hansen
6
posts
Jun 2
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