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Member postings for Steve J

Here is a list of all the postings Steve J has made in our forums. Click on a thread name to jump to the thread.

Thread: Your Hacked charger PSU's.
14/08/2020 14:41:38

Posted by Doc Marten on 14/08/2020 13:49:42:

£10 for a top quality, ultra safe CPU!

Or even a PSU. Actually, I was going to hang a little CPU and a display off its I2C interface, but there is go little data available, it's not worth it.

14/08/2020 12:25:13

Dell AA23300 (aka Astec DS550-3). 550W at 12V for £10.

img_20200814_120603388.jpg

Thread: NiMh Rx pack check report! ( And a warning?)
14/08/2020 09:52:57

Posted by Nigel R on 14/08/2020 09:38:53:

Just set the charger to discharge at fixed current, 1C or 2C, until 1V/cell is hit, then stop. Don't worry about "true 1V", this isn't how the normal discharge test works.

That is what my charger does.

1~2000mah 4.8v eneloop #2.jpg

Periodic checks are the way to happiness.

Indeed. The Eneloop 2000 that the above graph is for is still going strong and is checked once or twice a year.

Thread: Introduction and Engines query
13/08/2020 18:40:52
Posted by Simon Lumsdon 1 on 13/08/2020 12:08:55:

I was hoping to bolt the 52 onto the Cougar but it looks massive and frankly far too big, question, will the OS20FP be OK for use as a trainer, I think they recommend 25 as a minimum but was hoping I could use the 20 to begin with and move up from there? The alternative is to use the OS FS 40 but again its still looks too big?

I had a Leo .37 two stroke on the front of a Cougar 2000 and it flew well. A .52 four stoke strikes me as being on the large size, but not completely OTT.

Thread: Parkzone motor dimensions
13/08/2020 11:32:00

The BL 15 out of my ParkZone Spit has a 5mm shaft.

Thread: Electro mechanical retracts control board
12/08/2020 18:51:47

The electric retracts that I have (E-flight & HobbyKing) will stop if they haven't hit the limit switch within a certain amount of time. The E-flight suggested above would appear to be measuring the current and running until the motor stalls.

I had a look inside a cheap electric retract this afternoon. The board appears to have a microcontroller, four transistors, two limit switches and some passives on it .

12/08/2020 13:37:52

Posted by Richard Clark 2 on 12/08/2020 11:24:09:

As someone who has been a professional 'big' computer designer for over 35 years and am now working on the new 'post electronic' computers ...

Do you give out autographed photos with the highlights of your CV on the back?

12/08/2020 10:16:39
Posted by Phil Green on 08/08/2020 21:09:14:

You can do it much simpler than that and for much lower cost.

You have drawn an H-bridge with relays. Your way will have a servo driving a switch and the limit switches switching the motor current. I would go for an Arduino and an L293 (or other H-bridge circuit if more current is required) which would also allow control of the motor speed.

Thread: LED wiring
11/08/2020 12:14:25
Posted by Mike T on 11/08/2020 11:59:53:
Posted by Steve J on 10/08/2020 16:03:46:
That is how the nose light on my FunJet is done, balance connector to LED driver to 1W LED.

That looks like a cheap experiment, but the ready to go setup linked by BiB looks a bit of a bargain!

IMHO there is very little point in putting 30mA LEDs on models (unless you are putting a lot of them on).

Thread: What has happened to i.c. engines?
11/08/2020 10:32:14

Posted by Jason-I on 11/08/2020 10:12:20:

all these new draconian regulations and restriction do nothing to help newcomers into the hobby either.

Draconian? We have a basic registration and knowledge test. If you want draconian, have a look at what is being proposed by the FAA in the rebel north american colonies.

Thread: LED wiring
10/08/2020 16:03:46
Posted by Mike T on 10/08/2020 13:11:13:

I can see the appeal of using the balance plug, which is otherwise pretty much redundant when it's in the aircraft, but I assume it would be better to just connect to the red and black wires.

That is how the nose light on my FunJet is done, balance connector to LED driver to 1W LED.

Thread: Which would you choose and why?
09/08/2020 21:55:45
Posted by Colin Carpenter on 08/08/2020 18:22:55:

If it flies as well as all his other designs then it will be superb!

I have a Mytho S 30e and I don't like it. I wish I had bought something else.

Thread: Electro mechanical retracts control board
08/08/2020 14:34:02

I don't know what was in the SM Services box, but you could do this with an Arduino and an H-bridge motor driver board.

Thread: Banggood
07/08/2020 18:54:56

I have something currently en route from Banggood (China), I had a packet from Banggood (EU) earlier in the week and China are waiting for something to come into stock before they ship it to me.

Thread: Any chance of a last unread post button
07/08/2020 08:37:36

This forum has the worst software of any that I visit (I would say that BARCS has the best), but it is the one that I visit the most. The platform isn't everything.

Thread: FCC proposes $2.8m fine against Hobbyking for marketing non-compliant drone transmitters
06/08/2020 09:04:10

Posted by Barrie Lever on 05/08/2020 23:27:22:

I will say here and now that I hope HK go bust over the FCC fine, and that post Brexit the import restrictions with 'That country' are tightened up to restrict the likes of Bang Good.

The PRC has been waging economy war on the west for well over 20 years and winning. Hopeful one of the upsides of the current pandemic will be people realising how dependent they are on the CPC.

Thread: Is this Power Supply Suitable?
06/08/2020 08:30:45
Posted by EarlyBird on 06/08/2020 07:07:26:

Because of this example I have come to the conclusion that the forum should not advocate using any equipment in a way and for a purpose for which it was not intended. Simply because there are people out there who are a danger to themselves.

I am glad that my ancestors didn't adopt this philosophy. "You be careful with that sharp rock!" "Why do you have to burn your meat on the fire?"

PS Society of Model Aircraft Engineers ring any bells?

Edited By Steve J on 06/08/2020 08:40:40

Thread: FCC proposes $2.8m fine against Hobbyking for marketing non-compliant drone transmitters
05/08/2020 16:46:06
Posted by Martin Harris on 05/08/2020 16:16:57:

it's unreasonable to hamstring a global supplier by having to make completely different equipment for each market.

I disagree. Countries are allowed to regulate products sold in their jurisdiction. What would your reaction be if I came along to your flying field and transmitted 5W over the 2.4GHz ISM band?

If you want sell in the EU, you comply with the applicable directives. If you want to sell in the US and your device emits RF, you comply with the FCC.

05/08/2020 12:50:57
Posted by Erfolg on 05/08/2020 11:20:04:

There appears to be a very different response to the situation which arose with Spektrum and the EU regulators. I am referring to the apparent communication protocol between the Tx and RX on switch on. Spektrum were permitted time to become compliant and the oppurtunity to quietly withdraw the offending units at the retail level.

DMS2 complied with EN 300 328 1.7.1. DSX complies with EN 300 328 1.8.1. Spektrum had DSMX units on the market 3 or 4 years before 1.8.1 came into force (unlike some other manufacturers).

HK were fined because the ignored the FCC.

Thread: Is this Power Supply Suitable?
04/08/2020 08:12:26

Posted by Mike T on 03/08/2020 23:48:37:

But despite professing limited knowledge, he was actually himself proposing to follow a 'DIY' route and to that end specifically asked: Would this PSU Be suitable? If not why not and what would you recommend instead?

Told it probably was not (rightly, IMV), he was directed by others and myself to a far safer and proven DIY solution!

The 12V PSU in the OP appears to have exposed mains terminals and really needs putting in a box. With the server PSU's, the bits that are exposed are 12V and lower and it will have been manufactured to a higher standard.

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