R1 68 až 270 kOhm, viz textR2, R3 330 OhmC1 10 µF/16 VC2 1 µF/16 VIO1 NE555D1 až D6 LED 5 mm, libovolné barvyany colours deska s plošnými spoji bcs23Pouze jednou / Only oneR4 470 Ohm až 1 kOhmD7 LED 5 mm, libovolné barvyany coloursnapájecí zdroj / power supply
R1 22 kOhm D1, D2, D4 1N4001
R2, R4 2,2 kOhm D3 BZX83V003.9
R3 180 kOhm T1, T2 BC238 (BC546, …)
C1 1000 µF/ 16 V T3 BC639
C2, C4 10 µF/50 V IO1 GI123 (SAB123)
C3 100 nF/63 V, fóliový / film Deska s plošnými spoji bcs19
Reproduktor / Speaker 8 Ohm
Build-in charger for instruments powered single Li-ion or Li-pol accumulator. If external charge voltage not conected to charger, back current from accu to charger is very small (not measured ordinary multimeters)
This is a 2 LED flashing circuit. It is based on an analog flip flop circuit. This particular circuit was calculated to use blue or white 3V LED with a 12V power supply. If you are using red green or yellow LED, replace the 1K resistors for a 2.2K. This circuit will flash the led [...]
Very important: Use the proper wattage (See Schematic) for the resistors. The circuit was calculated to have the maximum LED brightness with minimum heat from the 12K resistor. With a “12Kohm / 2W” flame proof resistor. It will be slightly warm to the touch.
This is circuit MOSFET power amplifier OCL, Output 100w ,
use mosfet k134+j49 or Mosfet J162 + K1058 Output 112W at Speaker 8 OHM.
Power Supply +56V/-56V 4A /Ch.
Voice manipulation device specially intended for props
9V Battery operation.
Parts:
P1______________10K Log. Potentiometer
R1,R10__________10K 1/4W Resistors
R2_______________1K 1/4W Resistor
R3______________50K 1/2W Trimmer Cermet or Carbon
R4,R6,R7,R14___100K 1/4W Resistors
R5______________47K 1/4W Resistor
R8______________68K 1/4W Resistor
R9_______________2K2 1/2W Trimmer Cermet or Carbon
R11_____________33K 1/4W Resistor
R12_____________18K 1/4W Resistor
R13_____________15K 1/4W Resistor
C1,C2,C3,C8,C9_100nF 63V Polyester Capacitors
C4______________10µF 25V Electrolytic Capacitor
C5_____________220nF [...]
Three LEDs signal bumper-barrier distance
Infra-red operation, indoor use.
Parts:
R1_____________10K 1/4W Resistor
R2,R5,R6,R9_____1K 1/4W Resistors
R3_____________33R 1/4W Resistor
R4,R11__________1M 1/4W Resistors
R7______________4K7 1/4W Resistor
R8______________1K5 1/4W Resistor
R10,R12-R14_____1K 1/4W Resistors
C1,C4___________1µF 63V Electrolytic or Polyester Capacitors
C2_____________47pF 63V Ceramic Capacitor
C3,C5_________100µF 25V Electrolytic Capacitors
D1_____________Infra-red LED
D2_____________Infra-red Photo Diode (see Notes)
D3,D4________1N4148 75V [...]
This project allows instant start sequentially but a dozen low-voltage lamps 12 V / 60 W, and makes them fade and always sequentially (but slower). This system has been designed to meet the demand of a visitor who wanted ten recessed low voltage spot in a driveway to his house, with the following function: – [...]
This circuit allows switching on a LED when the battery voltage (12V) drops below a certain threshold. The operating system is based on a comparison of tension, which comes in a zener diode. If the supply voltage is 12V and the zener diode is a 10V model (this is the case in the diagram), we [...]
This is a good looking and practical device that can be useful in many areas where countdown timer is needed. This project is based on the PIC16F84A microcontroller. The time range can be adjusted between 1 and 999 seconds. This project has 3 buttons and one of them is named Set Button. In order to [...]
A VU meter is often included in audio equipment to display a signal level in Volume Units; the device is sometimes also called volume indicator (VI). In this project we are building a basic and low cost LED VU Metre circuit . The extent (range) display is -18 dBu to +3 dBu, spread over [...]
Today we have a new category “Projects” and a new electronic project 12 Channel LED Chaser with PIC16F84A.
This project is based on the popular PIC16f84A micro-controller.The heart of this project LED chaser is the PIC16F84A PIC microcontroller.A 4MHz crystal and capacitors C1 and C2 22pf is used for providing clock pulses to the micro-controller. The [...]
