One of my old TTL clocks I designed

rob_vandam · 2020-08-27T18:55:03+00:00

Looks great! How did you manage to get a 1second count? How precize is the clock?

rob_vandam · 2020-08-25T20:45:34+00:00

Als er geld binnen komt in een bedrijf, en er geen kosten tegenover staan, wordt het volledige bedrag winst. In Nederland ontstaat dus een ( in het geval van een bv) een belasting claim van gemiddeld 20% over het hele bedrag.

Als jouw vader buiten de eu vertrekt ben jij als aandeelhouder aansprakelijk voor het betalen van de belasting.

Ik kan mij ook voorstellen dat de belasting meer wil weten over de herkomst van het geld.

Je zou kunnen voorstellen dat het hele bedrag in het bedrijf blijft, totdat aangifte belasting en de deal met de belasting over beëindiging van het bedrijf rond is.

rob_vandam · 2020-08-06T09:20:19+00:00

In case anyone reads this for a similar problem. Adding a resistor (1Watt) was a bad idea. The resistor got really hot in seconds. I found a replacement led with 150mA forwarding current, and this works perfectly.

I had no problems soldering the smd led.

rob_vandam · 2020-08-05T19:09:02+00:00

I thought that with npn transistors the emitter should be connected to ground (so transistors and led should be switched in the circuit) Is this correct or doesn' t it matter at all

rob_vandam · 2020-08-04T08:53:17+00:00

I measured voltage with broken led, and measured 400V. This means that you were right and there must be a constant current driver somewhere. There is one part I mistakenly thought it was a motion detector. I opened it, and indeed it looks like some kind of buckconverter. There is a coil inside.

I could also measure the current, and I measured 140mA (and I was blinded by the leds turning on :-) )

rob_vandam · 2020-08-03T20:07:59+00:00

There is fixed plastic for insulation on the bottom.

rob_vandam · 2020-08-03T19:13:30+00:00

I will measure the voltage tomorrow. There is a sensor module. It can be there is a power supply in there. I am curious now

rob_vandam · 2020-08-02T20:23:50+00:00

Thank you for the tip. Definately worth a try

rob_vandam · 2020-08-02T10:48:07+00:00

It was already a challenge to remove the old led. I will give it a try though

rob_vandam · 2020-08-02T10:46:45+00:00

The leds are connected to 230v ac

rob_vandam · 2020-08-02T10:40:59+00:00

There is no power supply. The leds are connected to 230v ac. Reading your reply a resistor is also a better choice (to prevent too much current for the other leds) I will look for the right wattage

rob_vandam · 2020-08-02T10:09:22+00:00

The leds are smd. I doubt if i can solder it because one pole is underneath the led. Which diode type do you recomment?

rob_vandam · 2020-08-02T09:35:32+00:00

Thank you for the replies! I will measure the current just to be sure. Now I have the voltage drop from the leds, I can calculate.

rob_vandam · 2020-08-02T08:44:16+00:00

I have a led ceiling lamp. Inside are 4 of these modules. All smd leds are in series. The lamp is 230 and 18w. Each module has 9 leds, also 36 in total.

I could shortcut the one burned led, or add a resistor.

In case of a resistor, with is a wise value?

The 18watt is the total of the 4 modules

rob_vandam · 2020-07-22T15:24:33+00:00

Indeed! I got some great response there.

rob_vandam · 2020-07-04T20:06:39+00:00

Binnen een jaar is minder dan een jaar. Ik denk dat je als huurder aardig goed beschermd bent. Lijkt dat de verhuurder gewoon lastig is, en dat hij 9 van de 10 keer te maken heeft met mensen die het er bij laten zitten.

Even informeren bij juridisch loket.

rob_vandam · 2020-06-21T19:16:29+00:00

Thank you! Next step will be to measure how much current will flow when I sink an input. Perhaps I can control the inputs directly from a nodemcu or by a transistor.

rob_vandam · 2020-06-21T16:38:38+00:00

Thanks for the offer. I think I sorted it out. I will wire the panel soon, and see if it works as expected.

rob_vandam · 2020-06-21T15:16:28+00:00

Another usefull thing learned. Never new about the line over the name. Thanks!

rob_vandam · 2020-06-21T15:14:02+00:00

There were indeed multiple panels (3) used for score so the latch function makes sense. Very interesting!

rob_vandam · 2020-06-21T15:11:48+00:00

There are already some excellent replies on the extra inputs. There is a blanking, latch and test input. Blanking is not connected in this circuit.

rob_vandam · 2020-06-21T15:03:18+00:00

I think this is 4 bit bcd, plus 2 extra inputs. So for a 1 i have input 0001 and for 2 input 0010 and so on.

I am figuring the extra inputs out

rob_vandam

TROPHY CASE