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Search: Posts Made By: redwire
Forum: General Electronics Technical Discussion 05-09-2021, 01:15 PM
Replies: 29
Views: 407
Posted By redwire
Re: Harbor Freight car battery chargers any good?

It's normal for a lead-acid battery to have a "surface charge" which reads as slightly high terminal-voltage right after charging. It will drop down to around 12.8V at 100% state-of-charge.


The...
Forum: General Electronics Technical Discussion 05-08-2021, 11:42 PM
Replies: 29
Views: 407
Posted By redwire
Re: Harbor Freight car battery chargers any good?

Make sure the mode is correct for either Gel/AGM or flooded/standard.
Example BCI Group 35 battery is 45-60Ah and 12.3V is roughly 60% state-of-charge, so at least 14hrs to fully charge.

It...
Forum: General Electronics Technical Discussion 05-08-2021, 06:39 PM
Replies: 29
Views: 407
Posted By redwire
Re: Harbor Freight car battery chargers any good?

One review had blown capacitors, another said it's actually 12V 2A and 6V 4A so around 25W. The "4A" label is misleading.
That's the problem - a low battery will overload any charger and chinese...
Forum: General Electronics Technical Discussion 05-08-2021, 06:15 PM
Replies: 29
Views: 407
Posted By redwire
Re: Harbor Freight car battery chargers any good?

The super cheap Harbor Freight/Cen-Tech 12V battery float charger #42292/022-0192/61911/63161/62813 is almost always a piece of junk. It's a LM7805 jacked up to 13.5V...
Forum: General Electronics Technical Discussion 05-08-2021, 02:34 PM
Replies: 29
Views: 407
Posted By redwire
Re: Harbor Freight car battery chargers any good?

I just returned an Energizer 2A car battery 6V/12V maintainer charger - 5 yr warranty and the electronics were good quality but the firmware is crap.

It would look for several volts before turning...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 05-06-2021, 02:48 PM
Replies: 1,034
Views: 133,862
Posted By redwire
Re: ESR meter upgrades

If the crystal does not match the MCU fuse setting, as well as the F/W- there are problems. Fast F/W with low crystal will read smaller C values I think.
i.e. compiled F/W build is for 20MHz,...
Forum: General Capacitor Questions & Issues 05-06-2021, 02:24 PM
Replies: 12
Views: 708
Posted By redwire
Re: 8.5w Psu

Nichicon PW (https://www.nichicon.co.jp/english/products/pdf/e-pw.pdf) ESR:
1uF 50V [email protected], ripple 40mA 5x11
1uF 100V [email protected], ripple 30mA 5x11

10uF 25/35V [email protected], ripple 180mA...
Forum: General Electronics Technical Discussion 05-05-2021, 01:51 PM
Replies: 13
Views: 292
Posted By redwire
Re: Cleaning Off Blu Tac

You can see the chemical ingredients listed on the MSDS.
The worst mistake with WD-40 is thinking it's useful as a lubricant - it all evaporates fast.
Forum: Equipment Usage, Soldering, Techniques, and Reviews 05-04-2021, 12:20 PM
Replies: 47
Views: 9,301
Posted By redwire
Re: KSGER STM32 T12 soldering stations

Primary cap was 68uF 400V 16x26mm and KSGER increased to 82uF. I couldn't find any 82uF 16x26mm caps at 400V. The heatsink and Y-cap are near it, so 18mm dia. would be really tight and hit the Y-cap....
Forum: General Capacitor Questions & Issues 05-03-2021, 06:03 PM
Replies: 12
Views: 708
Posted By redwire
Re: 8.5w Psu

The VIP22a Vcc cap needs to supply high ripple current for the MOSFET's gate drive. 10uF 50V is more typical than 1uF and should have a ceramic cap in parallel to deal with 60kHz.
If you upsize to...
Forum: General Electronics Technical Discussion 05-02-2021, 03:12 PM
Replies: 13
Views: 292
Posted By redwire
Re: Cleaning Off Blu Tac

WD-40 is 50% Kerosene aka jet fuel and mostly solvent Naphthalene aka lighter fluid, with a teeny tiny bit of mineral oil.
Brakleen is 50% acetone, the rest naptha and toluene.

Plastic chemical...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 05-01-2021, 02:41 PM
Replies: 1,034
Views: 133,862
Posted By redwire
Re: ESR meter upgrades

I think Schottky leakage current is much higher.
I tried a 1N459A (https://www.onsemi.com/pdf/datasheet/1n459a-d.pdf) silicon low leakage diode and Vf=761mV but no Ir measurement shows up on the...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 05-01-2021, 01:53 PM
Replies: 1,034
Views: 133,862
Posted By redwire
Re: ESR meter upgrades

I have a bunch of germanium diodes tried out, and not so impressed. Readings seem to be different every run. AY-AT and stj's F/W I think 20MHz:

1N34A 371mV (DMM measures 317mV)
1.6pF--1.2pF...
Forum: General Electronics Technical Discussion 05-01-2021, 01:14 PM
Replies: 6
Views: 202
Posted By redwire
Re: B&K Precision 1604A Isolation Transformr,120Vac,150Va,1Phase Feedback wanted

It's targeted for doing TV repair, 1.25A continuous and 2A intermittent 6lbs.
Fine for troubleshooting and repair, but maybe a bit small if working on something that is loaded down past 150W.
I...
Forum: General Electronics Technical Discussion 04-28-2021, 07:46 PM
Replies: 46
Views: 714
Posted By redwire
Re: LED Resistor Calculations ...

Most high power LED dies have two bonding wires, with the die (substrate) glued or soldered to the cathode leg.
OP's having a third pad seems like it's just cheap or something.
Forum: Equipment Usage, Soldering, Techniques, and Reviews 04-28-2021, 07:24 PM
Replies: 47
Views: 1,026
Posted By redwire
Re: Finally built the Bob Parker "Blue" ESR Meter

Hey I looked at the schematic and it's already got a 22uF BP cap to block DC and not damage the ESR meter :)
It must be other shitty ESR meters I've built like the 5-transistor special that need a...
Forum: Troubleshooting Audio Equipment 04-28-2021, 01:57 PM
Replies: 16
Views: 2,816
Posted By redwire
Re: Kenwood DNX570HD No boot Red Triangle Lit - Characteristic Fault?

I have DNX Ver. 1.6.0 firmware 78MB, which has a bunch of Garmin files as well as other ROMs. Here is a pic of the files in it. PM if you have a big mailbox for it.
There's a separate load for DAB...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 04-28-2021, 01:41 PM
Replies: 47
Views: 1,026
Posted By redwire
Re: Finally built the Bob Parker "Blue" ESR Meter

What ESR chart did you go with?

I've heard measuring battery ESR can also be done if you add a series DC blocking capacitor. Good for many testing different batteries, LiIon and car batteries with...
Forum: General Electronics Technical Discussion 04-28-2021, 01:36 PM
Replies: 21
Views: 797
Posted By redwire
Re: Soldering Bliss...

Had a tech "improve" a Hakko 471 by filing down the heater and after that total fail, he gooped in the thermal paste. Just a hint- it didn't work, the grease can't take the temps and dries out =...
Forum: General Electronics Technical Discussion 04-23-2021, 01:37 PM
Replies: 7
Views: 363
Posted By redwire
Re: What is the resistor value?

That's not a resistor, it's an inductor in series with the tape motor power to prevent noise.

Usually no tape audio is an oxidized radio/tape switch or auto-reverse tape head switch in Walkmans...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 04-23-2021, 01:15 PM
Replies: 47
Views: 1,026
Posted By redwire
Re: Finally built the Bob Parker "Blue" ESR Meter

The Blue ESR meter firmware does show fault codes for many problems:
F0- Q11 not discharging Q10.
F1- C10 charging too fast.
F2- C10 charging too slow or not at all.
F3- Pulse amplifier bias Q8-C...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 04-22-2021, 03:17 PM
Replies: 47
Views: 1,026
Posted By redwire
Re: Finally built the Bob Parker "Blue" ESR Meter

The Blue ESR Meter works great for me, it just plain works with no hassles and a good investment.

The Zilog Z8 MCU is obsolete and I wondered about the kit's supply.
I wanted to write firmware...
Forum: General Electronics Technical Discussion 04-19-2021, 11:40 PM
Replies: 46
Views: 714
Posted By redwire
Re: LED Resistor Calculations ...

I found you can only dissipate a few watts at most with a board that size, unless you add a heatsink or cooling fan.

The LED's have a large (cathode) thermal pad which is supposed to have lots of...
Forum: General Electronics Technical Discussion 04-19-2021, 11:33 AM
Replies: 46
Views: 714
Posted By redwire
Re: LED Resistor Calculations ...

Cree JB5630 (https://cree-led.com/media/documents/data-sheet-JSeries-5630.pdf) 0.2W class around 2.8V 65mA, 3.0V hot at 150mA. Should be similar. Surprised to see the Vf is lower than rule of thumb,...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 04-17-2021, 08:21 PM
Replies: 11
Views: 266
Posted By redwire
Re: 878d H-E Error

I would measure ohms at the PCB connector with the two red wires, the one that ends up going to the heater. So plug in the GX connector and see what you measure. The heater should be around 20 ohms....
Showing results 1 to 25 of 500

 
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