Clap Sensitive On Off Relay Diagram Circuit

This circuit was intended to activate a relay by means of a hand clap. Further claps will turn-off the relay. An interesting and unusual feature of this project is the 3V battery operation. The circuits sensitivity was deliberately reduced, in order to avoid unpredictable operation. Therefore, a loud hand clap will be required to allow unfailing on-off switching. Q1 acts as an audio amplifier. IC1 timer, wired as a monostable, provides a clean output signal and a reasonable time delay in order to allow proper switching of the following bistable circuit. A discrete-components circuit formed by Q2, Q3 and related parts was used for this purpose, in order to drive the Relay directly and to allow 3V supply operation.

---

Circuit Diagram:

Clap Sensitive on-off Relay Circuit Diagram

---

Parts:

R1 = 12K
R2 = 1M
R3 = 6.8K
R4 = 220K
R5 = 2.2M
R7 = 100K
R8 = 22K
R9 = 6.8K
R10 = 100K
Q1 = BC550C
Q2 = BC328
Q3 = BC328
C1 = 220nF-63V
C2 = 22nF-63V
C3 = 220nF-63V
C4 = 22nF-63V
C5 = 22nF-63V
C6 = 47uF-25V
D1 = 1N4148
D2 = 1N4148
B1 = 3V Battery
IC1 = 7555 CMos IC
RL1 = DIL Reed-Relay SPDT
SW1 = SPST Switch
MIC1 = Electret Mic

---

Notes:

A small DIL 5V reed-relay was used in spite of the 3V supply. Several devices of this type were tested and it was found that all of them were able to switch-on with a coil voltage value comprised in the 1.9 - 2.1V range. Coil resistance values varied from 140 to 250 Ohm. Stand-by current consumption of the circuit is less than 1mA. When the Relay is energized, current drain rises to about 20mA.

Read More

On And Off Button Diagram Circuit

In this simple circuit we give the chip a little more attention than usual. It is astonishing what can be built with a 555. We are always infatuated with simple circuits using this IC, such as the one shown here. The 555 is used here so that a single push-button can operate a relay. If you press the button once, the relay is energized. When you press it again the relay turns off. In addition, it is possible to define the initial state of the relay when the power supply is switched on. The design is, as previously mentioned, very simple. Using R1 and R2, the threshold and trigger inputs are held at half the power supply voltage.

Circuit diagram:

On/Off Button Circuit Diagram

When the voltage at the threshold pin becomes greater that 2/3 of the power supply voltage, the output will go low. The output goes high when the voltage at the trigger input is less than 1/3 of the power supply voltage. Because C2, via R3, will eventually have the same level as the output, the output will toggle whenever the push-button is pressed. If, for example, the output is low, the level of the trigger input will also become low and the output will go high! C1 defines the initial state of the relay when the power is applied. If the free end of C1 is connected to Vcc, then the output is high after power up; the output is low when C1 is connected to ground.

Author: Ger Langezaal - Copyright: Elektor Electronics

Read More

Solve buzzing and noise on the amplifier circuit

Power amplifiers that we sometimes raises a raft of small drone as grounding less than perfect. The following are some ways to cope with the hum of the power amplifier: 

1. Keep sensitive circuits of the transformer, casing dimensions are not too small. One blog even suggested to use two-bok, bok special one for the transformer. For the toroid transformer or amplifier with a large transformer, should only contain a series of power amps, with no tone control. 

2. Change the position of the transformer, side by side into the lower side (the transformer is high) with facing a series of sensitive posts 

3. Use a spacer on each PCB board as high as half the height of the transformer, eg as high as 2.5 cm or more so that the PCB board parallel to the core / center of the transformer, here the effect of the weakest fields. 

4. We recommend using a stereo module instead of two mono modules This avoids wiring errors. If forced to, try to size cable between the right and left modules as long and as short as possible. 

5. Should take the ground path for the speaker of ct ct elco instead of the transformer, if the board pcb mounted two big elco (like elco power supply), take ground path of the speakers here, and check to hear! 

6. Power supply for radio (TX or RX) is very sensitive, use a capacitor 4x100nf, 4 pairs of these capacitors in parallel to each mem-diode (bridge). 

7. At the tone control circuit IC op-amp that uses a symmetric power supply, sufficient ground wiring is taken from the signal ground wires only. should IC power supply (7812) installed near the main power supply, not mounted near the tone control. 

8. Always use a stereo cable shrouded perfect (color stereo cable red-white-covered ground and wrapped in transparent skin. 

9. For power supply, use capacitors of 2200uF per ampere elco 

10. Zoom and ground wires as short as possible, especially a pair of elco (ct line between elco) power supply (can be tried for the amplifier blazer) 

11. For the amplifier should be mounted to the computer casing when not in the ground soil is diground PC casing soil 

12. Pairs of each kit to the circuit without passing groundnya nut / baud / spacer. Do not let the existing ground line at the hole pcb connected to the casing / box. Do not follow this ground. ground attached to the casing should have one. if necessary use a plastic spacer overcome the noise: 

1. Use the active component (IC) that qualified as TL084, TL074, not LM324. LM324 any brand of noise. TL084 is more guaranteed authentic yellow (ST), not white. For now, the IC TL084 is printed white-work unstable frequency high (treble breaks and more noise). For IC 4558 (NE5532) use plain white silk screening JRC4558D or TL072 - TL082 yellow, LF353 noise. LM741 (NE5534) can be replaced with the Hitachi HA17741, LF351 noise may also, has never been tried. we do not have to look for the brand and the price is more expensive because it is the most low noise. 

2. If necessary, the circuit power amplifier OCL, lowering its gain by lowering the value of resistor in the path gain from 33k to 22k speaker, mimics the gain-clone lower amplifier noise. 

3. Should simplify the circuit, the circuit is too complex is more susceptible to noise and interference. 

4. Should then potentio / volume mounted on the input-power amplifier, such as professional amplifier without tone control.

Read More

Ebay has Surprising Bargains on Auto Sound Systems

Articles - Anyone that is familiar with Ebay knows that it is a literal one stop shop when it comes to hundreds of thousands of unique and common new and used items. It should then, come as no shock that Ebay is also a great place to find excellent bargains when it comes to auto sound systems. Yes, you heard that correctly. While you cant exactly test out your tunes over an Internet connection you can generally check out the exact same brands youll find at Ebay in your local automotive stereo and entertainment dealerships. The difference is that you can generally get your hands on the merchandise from Ebay at a fraction of the cost you would pay retail.

Many people often find better deals when going through Ebay than they would even be able to find at many retailers online. I am constantly amazed at the wonderful bargains that can be found on Ebay not only when it comes to auto sound systems but full entertainment packages for your vehicle. Not only can you find great bargains on sound systems for your vehicle you also can find some thrifty deals on amplifiers, subwoofers, speakers, speaker systems, and tools, tips, and tricks when it comes to installation.

While there is the fact that you cant hear the system for yourself if you purchase it on Ebay that can be easily overlooked by going to local retail stores in search of the same system. That should give you a very real indication of what the system you are considering on Ebay will sound like. You should look at local stores and online before making the bid on Ebay in order to compare prices and bid with confidence that you are in fact getting a bargain. Also be sure you pay attention to shipping and handling fees that might be involved in your package delivery. Ive found that with a select few Ebay retailers, they kill you on the handling expenses.

Another drawback with Ebay is the lack of customer service after the sale. Be sure to pay close attention to the ad details concerning customer satisfaction and recourse should something go wrong with your package. You should also be sure that you always purchase the insurance on your package should you win the bid. Even at discounted priced, auto sound systems are a pretty hefty investment and you should take care that you protect that investment.

The only serious drawback I have found to buying from Ebay when it comes to auto sound systems is the fact that you have to have your system installed. Installation simply doesnt come with these car stereos and not all installers are willing to do the installation if you didnt purchase the product from them. Installing an auto sound system isnt the simplest of tasks and you need to have a plan in place to get the system in your car before you commit to the purchase.

Whether you have serious plans to purchase an auto sound system in the near future or you are simply entertaining the notion, it is definitely worth checking out the wonderful options that Ebay has for your automotive listening pleasure. We live in a world where every penny seems to count, see how many you can save by shopping Ebay.s

Read More

Simple Equipment on reminder Wiring diagram Schematic

This is an Equipment on reminder Circuit Diagram. Due to the low duty cycle of flashing LED, the average current drain is 1 mA or less.


Equipment on reminder Circuit Diagram

Read More