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A few of the interesting and useful hobby electronic circuit diagrams already published in this blog have been selected and compiled here for quick reference and understanding.
We all know about this little versatile chip which finds its way in almost all useful electronic circuits, yes our very own IC 555. Here the IC is configured as an monostable multivibrator, in this mode the IC activates its output momentarily by producing a logic high in response to a trigger at its input pin#2. The momentary activation time period of the output depends on the value of C1 and the setting of VR1. This in turn switches ON the load attached with the relay contacts but only for the time until C1 gets fully discharged. The circuit of a simple triac light dimmer shown below can be used for dimming incandescent lamps directly from AC mains. Just a couple of transistors are enough for implementing a simple water level alarm circuit and used for getting a warning signal when the water level inside a tank nears the overflowing level. A very simple temperature indicator circuit can be built using the circuit shown in the diagram. As per the setting of the preset P1, if the threshold is crossed by the introduced heat source, the transistor begins to conduct substantially, illuminating the LED and indicating the generation the heat beyond a particular set limit.
Inverters are devices which have important applications where normal electric supply is not available or difficult to obtain through conventional routes.
This circuit of a transistor power amplifier is outstanding with its performance and is able to provide a thumping 100 watts of pure music output. This simple emergency lamp circuit uses very components and yet is able to provide some useful service. This simple transistor circuit can be used for monitoring the dawn and dusk conditions and for switching lights in response to the varying conditions. This is a simple hobby project and exhibits all the properties of a conventional wax type candle. This circuit may be used as an automatic emergency lamp when there’s no power or when mains power fails during night times.
The battery is trickle charged for so long as the mainspower remains connected to the circuit. Thus the uppermost transistor conducts with the input music is at the minimum volume level and the subsequent transistor starts to conduct in sequence as per the volume or the pitch of the music. The interesting clap switch circuit shown here can be used in stairways and passages for illuminating the premise momentarily through clap sound.
The Darlington stage shown at the output is the timer stage which switches in response to the above sound interaction and illuminate the connected LEDs for some period of time defined by the 220K resistor and the two39 K resistors.
The circuit shown here can be used for detecting earth leakage conditions and for implementing the required shutting off the mains power supply. On sensing a possible current leakage at the input, the transistors come into action and switch the relays appropriately. Anything spoken into the mic of the presented circuit cab be clearly picked up and reproduced by any standard FM radio, within a range of 30meters of distance. The coil L1 consists of 5 turns of 1mm super enameled copper wire, having a diameter of around 0.6 cm. If you are looking for a circuit which can be used to latch the output in response to an input signal, then this circuit can be used for the intended purpose very effectively and also very cheaply. A momentary input trigger is applied to the base of T1,which switches it for a fraction of a second depending upon the length of the applied signal.
In one of the previous sections we studied a simple music light show circuit using mains operated incandescent lamps, the present design incorporate LEDs for similar intended light show generation.

In the above section we discussed a simple three transistor based flasher circuit; here we study another similar design, however here we incorporate a relay for the switching actions of the lamps. The circuit looks pretty straightforward and employs hardly anything substantial and yet performs the expected functions wonderfully well. Yes this simple transistor circuit can be used as a home door bell and it’s ON time can be set as preferred by the user, meaning if you wanted that the sound of the bell to remain switched ON for a particular period of time, you could easily do it just by adjusting the given pot. The actual tune is derived from the IC UM66 and the associated components, while all the included transistors along with the relay are configured for producing the time delay for keeping the music switched ON.
This unique work bench circuit utilizes only a few inexpensive transistors and yet delivers some truly useful features. The following circuit is no exception, it's a sensitive touch switch circuit using the IC 555.
This instantly reverts the output situation from low to high activating the connected relay driver stage. Though the circuit is very crude by its specs yetis able to amplify an audio input up to a powerful 4 watts in a 8 Ohm speaker.The transistor is a 2N3055 is used as a switch for inducing voltages in response to the input signals into one half winding of the transformer.
The two transistors are configured as a high gain, high sensitive switch, which also is capable of generating a tone when the shown terminals get bridged through the terminals coming in contact with the water inside the tank.
A generally purpose small signal transistor is used here as the sensor and another active device in the form of a1N4148 diode is used for providing a reference level to the sensing operation.The heat source which is to be measured is place in contact with the transistor while the diode is held at a relatively constant ambient temperature level.
The simple 100 watt inverter circuit shown here can be built and used for powering many electrical appliances like, lights, soldering iron, heater, fan etc. As can be seen in the diagram it utilizes mainly transistors for the implementations and a handful of other inexpensive passive components like resistors and capacitors. The shown device is able to switch ON automatically when mains power fails, illuminating all the connected LEDs.As soon as power is restored, the LEDs shut off automatically and the connected starts charging through the built in power supply. Thus the circuit can be used for switching ON the connected lights when night sets in and switch it OFF during day break. Here the LED is used in place of the candle flame, which illuminates as soon as the mains power fails and shuts off automatically when the power is restored. As shown in the diagram, the circuit utilizes a cheap incandescent flashlight bulb for the required illumination. The operation of the circuit is very simple, the music input is fed to the bases of the shown transistor array, each of them are configured to conduct at a specific voltage level in the incrementing order from the top to the bottom transistor. After the time lapses the LEDs are switched off automatically and the circuit returns to its original state until the next clap sound is detected. Unlike usual configurations, here the ground to the circuit and the relay is acquired from the earthing line itself.
The transistors and the corresponding parts are connected in the standard astable multivibrator mode, which forces the circuit to oscillate the moment power is applied.
The circuit is very simple and just requires ther shown components to be assembled and connected with each other as depicted in the diagram. The transistor and the respective winding of th transformer are configured as a high frequency oscillator stage. This simple turn signal flasher circuit can be easily built and installed in any two wheelers for the desired actions.
The On time of the relay can be controlled by adjusting the Pot VR1 while the pot VR2 may be used to decide after how long the relay responds once theinput trigger is fed by the switch S1. That’s common problem associated with our input mains AC line, where a high and a low voltage conditions are quite frequently encountered by us.
The feature includes continuously variable voltage from zero to the maximum transformer voltage and current variable from zero to the maximum applied input level.

The back emf generated across the winding of the transformer is effectively dumped over the speaker generating the required amplifications.
The water offers just about the right resistance value across the specified points of the circuit for initiating high pitched tone or the desired warning alarm. The whole circuit mainly involves transistors and therefore becomes easier to construct and implement.
The circuit employs a transformerless power supply for initiating the explained automatic actions and also for trickle charging the connected battery. As long as the input supply from the mains transformer is present the transistor remains switched OFF and so does the lamp. The clap sound or any similar sound is detected by the mic and converted into minute electrical pulses.
Also since the input coil is also referenced to the common earthing ground, the entire functioning becomes compatible and accurate. One relay detects and switches OFF when there’s current leakage through an appliances body, while the other relay is wired up to sense the presence of a the earthing line and switches OFF the mains as soon a wrong or weak earthing line is detected. The LEDs connected at the collector of the transistors start flashing alternately in wig wag manner. However at the very instant a feedback voltage also appears at the base of T1 via R3 from the collector of T2. The music signal varying with pitch and amplitude is applied at the base of the buffer amplifier PNP transistor. The connected battery is used for powering the candle”light and it is charged continuously when the unit is not being used and powered through the mains supply. However the moment the mains power fails, the transistor conducts and switches ON the battery power to the bulb, instantly illuminating it brightly. The LEDs shown in the diagram are connected in series and parallel, so that many numbers of LEDs can be accommodated in the configuration.
The stepped-up voltage at the output is directly used to drive the LED which are all connected in series for getting the desired balance and the illumination.
This feed back voltage instantly latches the circuit and keeps the relay activated even after the trigger from the input is removed. The amplified music is then fed across the whole array where the respective transistor receive the inputs with incrementing pitch or the volume levels and go on switching in the corresponding manner from start to finish, producing an interesting LED light sequencing pattern. Once installed, the circuit will faithfully flash the side indicator lights whenever the intended function is switched ON. The circuit keeps the relay and the wired appliances as long as the mains input stays within a safe tolerable level and switches the load OFF the moment a dangerous or unfavorable voltage condition is sensed by the circuit. The pot P1 is used for setting the maximum current while the pot P2 is used for varying the output voltage level up to the desired levels. The pots P1 and P2 may be adjusted for getting different interesting flashing patterns with the LEDs.
This light exactly varies its length according to the pitch or the volume of the fed music signal. The circuit also incorporates an optional buzzer circuit which can be also included for getting a beeping sound in response to the flashing of the lamps.

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