Free Electronic Circuit Schematics » SCR

Rain Alarm or Water Detector Circuit with SCR 106CY

admin — Wed, 09 Mar 2011 12:26:56 +0000

Rain detector circuit

Rain detector circuit can be applied to the project or any other hobby, which is so simple principles.
When it rains plate (sensor) will receive rain. And a dedicated work has paid to SCR1 and flow control Buzzer noise.

Electronic Part List

R1 1K 1/4 W Resistor
R2 680 Ohm 1/4 W Resistor
D1 1N4001 Silicon Diode
BZ1 12V Buzzer
S1 SPST Switch
SCR1 C106B1 SCR 106CY
SENSOR See Notes

Remark
1. The sensor is a small piece of PC board etched to the pattern showen in the schematic. The traces should be very close to each other, but never touching. A large spiral pattern would also work.

2. Make sure to use a loud buzzer.

Power Flasher Circuit with SCR BSTC1026

admin — Mon, 17 Jan 2011 07:04:16 +0000

: Power Flasher Circuit

There is no reason to resort to complex circuitry if what you are looking for is a simple flash power. The light flashes around 1Hz with a 100Watt bulb with a duty cycle of 50%. Maximum load that can be driven with this circuit is 200Watt, and if you want to have another frequency you must change the value of the capacitor. To 110VAC operation was not tested, though I expect the work, provided that the heaters are set at about half the amount indicated. SCR BSTC1026 is manufactured by Siemens, but other semiconductor equivalent sensitivity with standard port, should work fine.

WARNING! -

This circuit is directly connected to the mains and precautions must be taken. A more modern design would use a sensitive gate SCR, other low-power resistors, further resistance between gate and cathode, and a 10mF, 250V electrolytic capacitor

Thermostat circuit with SCR TIC206M

admin — Wed, 08 Jul 2009 16:16:36 +0000

This post is a simple thermostat circuit which can be used for a relay in a small space heater on the relay. The contacts of relay should be evaluated on the current needs of the heating.

The dangerous circuit in AC .You should be use the carefulness in the experiment.

thermostat circuit with SCR

The temperature fluctuations are indicated by an (1.7K @ 70F) thermistor position in series with a 5K potentiometer which approximately 50 mV / degree F at the entrance to the LM741, comparator A. The two 10K resistors to pin 7 of voltage is the same as in half the supply voltage and the hysteresis range, or about 3 degrees of 150 millivolts. The beach hysteresis (temperature range, where the obligations and sold relays) can be connected to the 10K resistor between pins 1 and 7 A higher value reduces the stretch.

In operation, the resistance is set so that the relay switch, comes to the desired temperature. A drop of three degrees the temperature should be moving to on the back and to stay until the temperature rises back to the level materialize. The relay action can be reversed, so it switches from the lower field by reversing the position of the 5K potentiometer and thermistor. The Z-diode 5.1 volt circuit regulates the voltage so that small changes in the provision of 12-volt-effect does not work. Tension in the thermistor should be half the supply, ie about 2.6 volts when the temperature by 3 degrees within the range set potentiometer. Most everything thermistor can be used, but the resistance is greater than 1K ohm at the temperature of importance. The resistance must be two times the resistance of the thermistor when the adjustment ends in the vicinity of the headquarters.

SCR Inverter circuit with BSTC1026

admin — Thu, 25 Jun 2009 01:33:40 +0000

Only drawback with the circuit is that it might latch in the conducting state

SCR inverter circuit

if device is too heavy or if there is a short at the output, this requires some kind of protection, on the input line, in the form of a fuse or similar.

The transformer used is a 10Watt mains type with 6Vdc+6Vdc windings on the SCR side and a 110V+110V windings, in series, at the output. Efficiency is 50% and the ideal load is equivalent to a 22k resistor, 5Watt. Output waveform is vaguely sinusoidal at a frequency of 400Hz.

For circuit please see and click the picture .