New Circuits Page 191
- Page 191
-
GENERAL DESCRIPTION The TDA7000 is a monolithic integrated circuit for mono FM portable radios or receivers where a minimum on peripheral components is important (small dimensions and low costs). The IC has an FLL (Frequency-Locked-Loop) system with an....
-
-
Various types of amplifiers like power amplifiers, audio amplifiers, tube and stereo amplifiers, sensor amplifiers, rf amplifiers, sound amplifiers, video amplifiers etc...
-
-
Here`s a design of a phone bug circuit. This wireless telephone line spy circuit can be used to transmit the phone conversation to a nearby FM radio. This circuit must connected to a normal phone line. This is the figure of the circuit; The first transistor....
-
This schematic is a tone transmitter. For sufficiently small values of the resistor, it outputs a tone, so having a resistive mic (carbon mic) in parallel with or in place of the resistor. would modulate the tone frequency with the voice. I`m not sure how....
-
Gain adjustment will be more flexible if it controlled by a voltage signal, since we can use many methods to provide user interface. We can control it by a....
-
-
This is a design of the circuit diagram of a simple and straight forward battery charger that can be used to charge all type of 12V rechargeable batteries including car batteries. For indicate when the battery is fully charged, the ammeter reading will be....
-
A very lab adjustable power supply that can provide an output voltage between 0 and 60 volts can be designed using this circuit diagram. This lab power supply can be designed with LM723 chip or for higher output voltages, with L146. Output current is also....
-
-
Today`s electronic designs are focusing more on optimizing efficiency in an attempt to minimize unnecessary power dissipation not only to maximize battery life in portable applications but to also assure that the application is running as cool as possible.....
-
This circuit is IC controlled emergency light. This series of automatic switching-on of the light on mains failure and battery charger with overcharge protection. When mains is absent, the relay RL2 is in deenergised state, feeding battery supply to the....
-
-
A touch screen is an electronic visual display that can detect the presence and location of a touch within the display area. The term generally refers to touching the display of the device with a finger or hand. Touch screens can also sense other passive....
-
Using this circuit diagram, can be designed a very simple AC voltage converter, which converts the 240V AC power to a voltage of 110V. Circuit can be successfully used to power electrical devices that require a supply voltage of 110V. If su....
-
Balance indicator for power supply show if a symmetric power supply is really symmetric or not. With two comparator pairs from a LM339N quad comparator we....
-
The following circuit shows about Infrared Toy Car Motor Controller Circuit Diagram. This circuit based on the 4017IC. Features: operating at ....
-
This circuit is a simple battery-powered switching regulator provides 5V out from a 9V source with 80% efficiency and 50-mA output capability. When Q1 is oon, its collector voltage rises, forcing current trhough the iinductor. The output voltage rises,....
-
This is 10.7-MHz IF amplifier circuit. This circuit is used in many application such as cell phone base station receivers (final IF) and FM broadcast receivers..
-
Can i use the following circuit or is there any special IR decoder IC and schematics available If the decoder supports any remote is good and well, is it possible But i want to control variable resistor via IR without relays(Means not any different fixed....
-
The final amplifier is the power source of every audio installation. Its job is to convert a small alternating voltage into a powerful signal for driving l....
-
This remote telephone bell ringer allows you to use a large (and loud) external bell in place or in addition to the built in (and rather wussy) ringer in most modern telephones. This is ideal for large outdoor areas, noisy shops or those hard of hearing.....
-
To me the E1T counting tube is unmistakably one of the most intriguing tubes ever made. It was invented and developed into a product by Philips in the period 1946-1954. On one of my other pages I have posted an in-depth study of it`s origins. It has long....
-
-
analog-to-digital converters (ADCs) | printed-circuit board (PCB) | microcontroller or digital signal processor (DSP) | total-harmonic-distortion (THD) | ignal-to-noise ratio (SNR)...
-
-
-
Construct a variable 5A, 2V to 25V Regulated Power Supply using LM338 Adjustable Regulator. Power supply schematic and parts list is provided here ....
-
Right! Now that I have finally solved the issue on the charging here is prototype 1 of the circuit. It uses 2 voltage dividers to give 2.0v to D- and 2.8v to....
-
This example describes use of HS101, HS201 radio transmitter and receiver modules made of radio-controlled rotating color lights, it is essentially a multi-channel radio remote control device codes for a small dance floor or home use. Users stand on any....
-
-
Electronic Schematics collections where they discuss about electronic circuits schematics, printed circuit board diagrams and electronics projects ..
-
Generally, during power up of the apparatus, the capacitor is the main reason that surge current emerges, the synoptic diagram of the principle is shown in Fig. 1. Have it in the picture after K1 closes, the intersection of capacitor and C begin, charge,....
-
A Norcold DE560 that was working fine until I turned it on this year. It`s in a boat and when I turne the refrig breaker on it, it pops immediately. is there a fuse or something on the fridge I can check Ok the only thing that will cause the circuit breaker....
-
The circuit described here was designed as an addition to a remotely controlled garage door opener. The problem was that a brief burst of interference, arising from a thunderstorm or a mains spike, was enough to trigger the mechanism, and the author found....
-
Ladder logic programming method is a method commonly used in electrical simulation schematic control system programming languages evolved. A circuit control system but the basic purpose of the decision in some cases all the load circuit should be opened or....
-
-
Some relays will become warm if they remain energized for some time. The circuit shown here will actuate the relay as before but then reduce the hold` current through the relay coil current by about 50%, thus considerably reducing the amount of heat....
-
This is a rather old project I`ve done around 2005 but was not published on my website until now. The idea of building a torch using a glue stick came to my mind when I realized that an AA battery fits perfectly into the glue stick`s plastic case. To make a....
-
The clock, which is made from 25 CD4000 ICs, three 555/556 ICs and a handful of discrete components, includes an alarm and a way of setting the clock that until now I have only seen implemented using microcontrollers. All this makes for a rather involved....
-
The circuit integrated la3607 allows to just set up a graphic equalizer of 7 bands for a channel adding some capacitors and variable resistors to the circuit. The cut frequency can be adjusted using variable resistors. It possesses high stability for loads....
-
This circuit may be tuned to operate over the range 87-108MHz with a range of 20 or 30 metres. I have used a pair of BC548 transistors in this circuit. Although not strictly RF transistors, they still give good results. I have used an ECM Mic insert from....
-
This little broadcast FM transmitter has 500mW of RF output power and runs of 12-15V battery or power supply. DC whose signal modulated by FM using four transistors. Transmitter includes four transmitter stages and draws around 100-150mA of current. Using....
-
-
A very useful expansion board for our PIC development board. It will be a Do It Your self (DIY) LCD Expansion board. The expansion board can be plugged into the PIC development board to add 16x2 Alphanumeric LCD Support to it. Since LCDs are required in many....
-
Here is a simple circuit diagram I think will work for the charger. I already have the transformer, two SCRs, maybe the capacitor, heat sink, and a case to mount it all in. If you go for lead- acid batteries and forget the SCR`s, or put them in a circuits....
-
-
Circuit Power Amplifier has a power output of up to 1500W RMS power amplifier circuit is often used to power sound systems keperlun for outdor. In the final image can be seen a series of power amplifiers using 10 sets of power transistors for the ending.....
-
To measure the input impedance of an unknown circuit first set the signal genaerator to a current source of magnitude 1 amp. You also need a shunt resistor of 100 Meg. This setup is useful for measuring amplifiers, filter and oscillator circuits. Use the....
-
-
This is the door bell circuit with flashing LEDs to make the circuit more attractive. IC1 (NE555) is applied right here as being a clock generator. It is actually set up as an astable multivibrator whose frequency could be altered using the support of....
-
The following circuit is an electronic approximation of the gold leaf electroscope`, except that this electrometer indicates polarity as well as electric field magnitude. It is incredibly sensitive! It will detect a television or an electrostatically charged....
-
Whatever past project these were used in obviously required three cells to be wired in parallel with a rather large (4700 uF) capacitor on a perf board. There were 13 of these board assemblies, for a total of 39 solar cells and 13 capacitors (not to mention....
-
The easiest solution would be to take a cheap wireless toy car take out its receiver module along with its remote and use them in your robot. The other way round is this to make your own RF remote We will be using ASK (Amplitude Shift Keying) based Tx/Rx....
-
This portable am fm radio circuit is designed using the LA1800 IC and some other external components. As you can see in this circuit diagram the LA1800 manufactured by Sanyo Semiconductors, require few additional components. Also the output signal is driven....
-
Integrated circuit Ul (an NE602 double-balanced mixer) is a combination oscillator and frequency mixer. Signals from the antenna input (at Jl) are fed through dc-blocking capacitor C1 to the RF-gain control, Rl, and fed to the input of Ul at pins 1 and 2.....
-
-
LED guard-rail tube has another name called beautifully the tube, it is a kind of advanced LED decorative illumination lamp decoration products. Use LED of red, green, blue 3 kinds of colors as the light source, has used microelectronics and digital....
-
Beginners Tutorial 1: Building a Circuit on Breadboard - how to build a simple and easy circuit on breadboard for beginners in electronics. Learn to use a LED and resistor....
-
-
This is a fan controller for an audio/video cabinet. It uses a PICAXE 08M and a DS18B20 temperature sensor. The fan is turned on at 30 degrees C (~86 F) and off at 28 degrees C (~82 F). The green LED is the activity indicator and also serves as a "ballpark"....
-
-
-
-
This tutorial explains how to read the content of the microcontroller `s flash memory. The source microcontroller reads the content of the memory and displays it on the LED s. The content is nothing but the program written in the memory of microcontroller.....
-
-
This is a battery tester circuit.This circuit is used to indicate whether the level of a battery voltage is normal, under-voltage, or over-voltage, very....
-
This is 12V Car Battery Charger simple circuit. This circuit is designed to solve some problems that occurs in most car battery chargers. The problem that occur in most car battery chargers is when the charger is not turned off, the battery will overcharge,....
-
This handy, pocket-size mobile transmission detector can sense the presence of an activated mobile phone from a distance of one-and-a-half metres. So it can be used to prevent use of mobile phones in examination halls, confidential rooms, etc. It is also....
-
-
The Pierce oscillator is a very simple circuit and as with the ring oscillator also uses inverters (actually just one inverter will do). The principle of operation, however, is very different. While the ring oscillator exploits the incremental propagation....
-
The following schematic shows the Relay Wiring Circuit Diagram for controlling an Air Conditioner or other higher high-current device from a microcontroller....
-
This is a 12V battery checker circuit that uses 3 LEDs that light up at their respective voltages. The red LED lights up when the battery voltage is between 8 to 10V, the orange one at voltages between 10. 5V to 12V and the green one when the battery voltage....
-
-
This is a circuit of subwoofer active filter circuit is a 24 dB octave filter with a Bessel character and cutoff frequency of 200 Hz. So, if you are interested in experimenting with audio circuits in subwoofer range, this circuit is for you. This is the....
-
-
This circuit is the improved hartley oscillator circuit, changing the base current can adjust the frequency in a given range. The output signal amplitude is higher than 6V in 6k? load resistance,and it is suitable for electronic cello circuits....
-
This UHF wideband amplifier(Ultra High Frequency amplifier) has a total gain of 10 to 15 dB in the 400 850 MHz domain frequency so it can be used where the tv signal is weak. For this UHF antenna tv amplifier to work correctly you need to cut the components....
-
Programmer in my "AVR software and technical Library - April 2003" CD-rom and decide to publish it. The reason was, that this programmer is very stable and works perfect with AVR Studio 4. I hadtested it before published it, with AT90s2313 and its worked....
-
This circuit was designed as an aid in parking the car near the garage wall when backing up. LED D7 illuminates when bumper-wall distance is about 20 cm. , D7+D6 illuminate at about 10 cm. and D7+D6+D5 at about 6 cm. In this manner you are alerted when....
-
-
This circuit features automatic exit and entry delays - an optional instant alarm zone - an optional intermittent siren output - and an automatic reset. By adding external relays you can immobilize the vehicle and flash the lights. The alarm is set by....
-
The other transistor (T2) is controlled by the current flowing through the resistor (R1). If a DALI slave unit is connected, this current will be the same as that flowing through the power transistor. The value of the resistor is chosen in such a way that....
-
This is a silicon transistor circuit showing typical voltage values. When the forward base/emitter voltage is 0.6 to 0.7 V, the transistor is silicon. Germanium transistors will have a forward base/emitter bias voltage of 0.2 to 0.3 V This is a silicon....
-
I liked the idea of distributed active RIAA correction and also the concept of using negative feedback to linearize the input stage. Now, the original Collin design has a few significant flaws (openly admitted by the author in the same article), one of them....
-
Extending BT telephone sockets can result in hum appearing on the line or, if two telephone lines are taken through the same cable, cross talk from one line to another. This is simply the lack of using twisted pairs correctly, here we show you how it should....
-
LED sequencer: follows the rhythm of music or speech, 9V Battery-operated portable unit The basic circuit illuminates up to ten LEDs in sequence, followin....
-
A unit which is often very useful, if we need to isolate, in sound circuits, two stage between them. Then we can use this circuit which has an amplified unit, which gain X1, we do not use total negative feedback, only local, with the result that distortion....
-
-
This is a similar circuit to the above and provides a 4 LED bar graph indicating the voltage of a common 3.6 volt Lithium - Ion recharable cell phone battery. The reference voltage is provided by a TL431 programmable voltage source which is set to 3.9 volts....
-
One of the goals of Movable Party is to provide an interactive experience for audiences/participants. Since power will be generated from a hub motor attached to the rear wheel of each bike (see this post ), the speed of the rear wheel directly translates to....
-
BA3822 five-point stereo graphic equalizer integrated circuit has two channels, and the five center frequencies for each channel are independently set using external capacitors. These IC feature a wide operating power supply voltage range (VCC = 3. 5V to....
-
An electronic dice is a classic first project for those getting interested in electronics. A timer, counter and a few LEDs makes a circuit that can also add a new twist to some old boring board games. When the switch is pressed, a 555 timer in astable mode....
-
A very simple class B power amplifier can be designed using TDA8560 audio IC. The TDA8560 amplifier has an internally fixed voltage gain for excellent channel balance. This audio amplifier electronic project will provide a dual 40 watt output power. This....
-
The transmitter function is to modulate the original signal frequency of the signal carrying the message, the process is called modulation, the circuit realization of this function is called frequency modulation circuit. al of the circuit. FM tuner is....
-
The circuit is okay (not ideal for quality but it will work), but there`s one small issue if you want to feed the output to your Arduino. As shown, the output will swing below ground (i. e. it will be biased at 0V) and your Arduinos analog input will only....
-
-
-
This battery-powered monitor has been designed to provide an audible indication of keying for those whose rigs lack a CW sidetone. Its sensor wire is wrapped around the transceiver`s coax no direct connection is required. Of course Morse isn`t the only use....
-
In this electronic roulette wheel (see Fig. 1. ) the timer 555 works as a generator of pulses with fading frequency. The counter 4017 switches LED`s one by one in the selected string, and the divider by two based on D-type flip flop (4013 IC) selects the....
-
-
In this arrange ment a high value inductor or choke L is connected in series with the rectifier element and the load, as illustrated in figure. The filtering action of an inductor filter de pends upon its property of opposing any change in the current....