Usually, for made a simple square wave generator it use old 555 (you can see my experiments with 555 at Experimente cu “batranul” 555).
I like more CMOS chips… so, I use 4093 series (CD4093, MMC4093, etc) who is Quad 2-Input NAND Schmitt Trigger (see datasheet).
I use schematic for gatted oscillator:
A funny montage is same police lights:
I use Livewire software for simulate this schematic and I made 2 movies:
– original police flasher only CMOS 4093:
– police flasher only CMOS 4093 – logical views
Initial schematic has formulas for calculate times.. imposible formulas at first view, but if study datasheet, we can calculate values.
I calculate times for three value of power suplly:
– for 5V:
– for 10V:
– for 15V:
After that, we can see dutty factor (fu) is about 50%.
Frequency f=k*R*C, so:
Recomadated values are:
For minumum recomandated value for resistor:
For maxim value of resistor:
Theoretical frequency is from 1Hz to 234kHz.
Practical schematic is:
If change just capaciter:
I made a new simulation with Livewire software and new movies:
– simulare functionare oscilator cu poarta CMOS 4093
– oscilator cu poarta CMOS 4093 part2
I found on Minimaxfly channel on youtube a movie named Signal lumineux de Police Flasher CMOS 4093 Electronique who use my schematic:
For use a single phase motor in both directions for made a hoist, whinch or for other applications must use a simple schematic named PSC (Permanent Split Capacitor), see docs from Washing machine two speed electric motor.
Base schematic is
For use in host when you need a limit switch for up, practical schematic is:
Note: limitator = limit switch
I made a movie with a rebuit hobby hoist:
Intr-un articol anterior, am prezentat schema de legare a unui motor monofazat ce echipa un troliu (electropalan cu cablu) pentru a functiona in ambele sensuri:
Totul se baza pe informatiile prezentate in articolul Reutilizarea motorului cu 2 viteze de la masina de spalat automata (Washing machine two speed electric motor).
Acum, am dat de alt troliu/electropalan alimentat la 230V~ la care se umblase in schema si diferea de cea prezentata anterior, in sensul ca aveam la dispozitie doar 3 borne si o cutie de comanda cu butoane prin cablu, in care se gasea si condensatorul.
S-a pornit de la aceasi schema de baza , in schema “PSC (Permanent Split Capacitor). Acest motor are un condensator conectat permanent in serie cu infasurarea de pornire, ceea ce face ca aceasta sa devine infasurare auxiliara odata ce rotorul a atins turatia nominala”.
am facut un filmulet numit test dupa reparatie troliu (electropalan) monofazat din gama hobby
After I became familiar with P20F04D-12L display module using Arduino develelopment board, I decided to made a weather station (temperature & humidity). The first tests we presented in the previous article named P20F04D-12L display with HUB40A interface and 16×8 2R1G1B pixels.
For test I use 2 module and I create a “picture” with 32×8 pixels for clock data (hours and minutes) and a real case is:In movie named afisaj 2R1G1B cu interfata HUB40A controlat de Arduino (8) I try different type of colours and speed animatrions:
Then I made a new “picture” for temperature:and I create a string with 512 elements (32 columns & 8 rows): Now, on my display I see:After this, I made a new “picture” for humidity:and a new string with 512 elements:Now, on display I see:
I made a new movie, named afisaj 2R1G1B cu interfata HUB40A controlat de Arduino (9)
using an original sketch named hub40a_test4m1s1.ino and I made 2 movies:
original article in roumanian languageThis display module named P20F04D-12L has 16×8 pixels, each made with 2R1G1B leds (2 red leds, one green led & one blue led).
For power supply it use 5V (VCC & two VDDs):and interface for control is named HUB40A:Usual, this modules are used as street display with maximum 8 rows:and cascaded on columns:
I search for info about HUB40A interface, but i found few usefull datas:and I found on board 2 chips 74HC245 and 32 chips MBI5026.Display has 2 big zone (upper & bottom rows), each with 4 square (4×4):Data is put serial like as ususal shift register, just there is 2 zone & 4 colour (2 red, 1 green & 1 blue):For control the display module I use a Arduino with this schematic:
For power this module I use a 5V/40A power supply module (can be used for 4 display modules).
First, I change a sketch from www.arduino.cc/en/Reference/ShiftOut and now I see a “picture” with my name with base colour:I made a movie named afisaj 2R1G1B cu interfata HUB40A controlat de Arduino
Then, I put 2 colours to made other colour:and I made a new movie named afisaj 2R1G1B cu interfata HUB40A controlat cu Arduino (2)
Finally, I put all colour (one red, one blue & one green):Next step was to put text at bottom zone:and using both zones:and I made a new movie named afisaj 2R1G1B cu interfata HUB40A controlat cu Arduino (3)
like in movie https://youtu.be/muSU_hueHlk
like in nest movie named afisaj 2R1G1B cu interfata HUB40A controlat de Arduino (5)
and “white”using one red, one green and one blue:like in movie named afisaj 2R1G1B cu interfata HUB40A controlat de Arduino (6)
For this movie I use sketch HUB40A_test4m1g.ino !!!
like in movie named afisaj 2R1G1B cu interfata HUB40A controlat de Arduino (7)
For this cases, I use sketch named HUB40A_test4m1h.ino !!!
In more portable devices it use LM386 who is 1W audio power amplifier with x20 to x200 gain (26..46dB) and BASS BOOST feature.
I made a sound surveillance system using LM386 with huge gain like in article How to get 74dB by LM386 writted by Kazuhiro Sunamura.
At Decibels (dB) Calculator page you can understund the conversion between gain using dB, e.g. 74dB = x5000 and 20dB = x10.
I design a schematic who use jumpers for classic and special gain:
The cases are:
- with all jumpers free, gaine x20:
- close 1-2, gain x20..x200:
- close 2-3, gain x50..x5000:
For unidirectional intercom schematic is:
A version a board and montage can be:
In a old paper magazine named ELEKTOR I found a nice schematic
Using Eagle PCB software I designed a version for made this schematic:
On net, I found a movie with similar montage, named 110 or 240 Volts blinking LED:
If you put this module in parallel with a incandescent bulb, LED flash when bulb is on (work with led lamp or other lamp):
If you put this module in parallel with switch at incandescent bulb circuit, LED flash when bulb is off:
I made simple circuit in air:
I put a additional resistor for better intensity of LED:
I made a movie named 230V LED flasher
I recover an old article with a flasher led powered by main supply (230V~/50Hz) – english version !
Am recuperat un vechi articole cu un led pulsator alimentat de la reţea (230V~/50Hz).