Nutrition avoid interference choke and capacitor, I in his works which are not used for higher prec

In the first article I've compiled and tested a prototype switch for Arduino Nano V.7. Arduino controller used as a convenient device for debugging schema and code, but the finished device Arduino overkill and pricey. So here the scheme of the final device on the controller Atmega328. miller Why Atmega328, rather than Tiny or Atmega48? Because sound effects occupy approximately 28Kb Flash program memory controller, and the controller has Atmega328 total memory 32kB. In addition to already Tiny would have to rewrite the control code of the program and re-debug. Describe the operation of the switch will not be here because his work is painted in a previous article, so go directly to the description of the scheme of the device. Used for load control MOC3061 optocoupler and triac BTA140. Optocoupler provides isolation controller. Optocoupler also use the detector zero, to reduce power interference when turning. miller Triac selected with high current 25A for maximum reliability, it can withstand pulse current 190A. Moreover, the price of this triac is practically the same as in BTA136. IR LED BL-L314IRCB, you can apply the same or from any remote control. Phototransistor LTR-3208E, or any analog thereof. In the scheme provides a connector for programming miller the chip ICSP Hex Fail to controller firmware can be downloaded here The device is powered from the adapter-plan miller mobile phone charger. Slightly modify it for higher reliability. Why adapters fail? In most schemes NICs operate a low-power transistor in TO-92 - KSP44, MPSA44, 13001 and other similar transistors. It's pretty low-voltage transistors, the breakdown voltage of 400V, BF420-up miller to 300V, they work almost at the limit of their capabilities, including in terms of temperature (the temperature of their body on the rated load current up to 70 C). So they often fail (usually at the moment when the network adapter or the incorrect mode of operation, when the mobile is connected to the output is connected to the network adapter). Typical schemes of two adapters Adapter For reliability you need to replace the transistor 13001 to 13002. Given the fact that the circuit breaker in the standby mode consumes less than 50mA, and the power adapter is designed for 500mA and the power is supplied to the circuit is continuous, then we can say that there are no extreme miller loads for the adapter will not work and it will be a long and stable. If anyone may be, any questions about the scheme, please miller ask, I will answer with pleasure.
Online is not enough miller of such projects with the possibility of the power cord. I think it is better not to use exercise, especially if you plan to cram it all in a conventional switch box. You can borrow a power supply here.
Keep! Should not be left connected to the charging network 24/7, so even in a remote place in a closed box. Option 1: look for a suitable PSU industrial performance, though not sure that there are enough small. Option 2: Collect the most of components, credible, with the calculation of thermal regimes and with the stock in the parameters. Can transformerless circuit as suggested above. In the end, it's easier - safer.
Contact can occur when debugging scheme on the table
Is that a problem to take a small mains transformer miller with output 8-20V rectifier, regulator 7805 and a couple of capacitors. miller And easier and more reliable, and less expensive (some details can dig with some other PSU).
In my opinion, it is better to make the power supply isolated from 220, on the basis of a pulse converter, you can use a simple circuit from the link above. Customize still less dangerous. Well, different surges nutrition potentially be less destructive.
Probably this depends on the type of manufacture. If this - mass production, I fully agree with you, it's easier to do - that is, parametric stabilizer. Ultimately - I think there will be less complaints. However, if the product miller is experienced, it is more convenient not to risk a high-voltage power supply and do. For security reasons, only yourself.
Nutrition avoid interference choke and capacitor, I in his works which are not used for higher precision devices do without choke at voltage levels from 190 to 250 everything works fine) And what is the result of work? enough ready schemes, and literature and methods of calculation without transformer power supply, and the easiest and most convenient form without transformer - in my opinion it is a quenching capacitor. Here there is only a couple of difficulties. 1. Himself blanking capacitor should be of good quality. 2. Isolation, isolation, isolation miller and again. and resulting complexity, but now quite a lot of different schemes decoupling from special miller chips and drivers to simple optocoupler. The main advantages of such a scheme is the price, size, weight.
Flying in the network bursts - is