Simple Sound Effect Generator Circuit Diagram Using HT2884

Here’s a design circuit for Simple Sound Effect Generator Circuit Diagram uses the Holtek HT2884 IC to produce 8 different sound effects. This is the figure of the circuit;

The HT2884 is a CMOS LSI chip equipped with tone circuit, noise circuit, and other control logic to generate various sounds to be used in sound effects production. This IC features: single power supply (2.4V – 3.3V), low stand current, auto power-off function, and eight different sound sections.

Simple 9V Wireless Microphone FM Transmitter Circuit

This is a design circuit for FM transmitter circuit can be used as a wireless microphone, can be received by an ordinary 88- to 108-MHz FM broadcast receiver. For the power supply, this transmitter circuit is powered by a 9 V battery. Here’s the figure of the circuit;

To comply with the radiation limit of FCC rules, keep the antenna length under 12 inches. L1 is 6 turns of #24 wire wound around a pencil or a 1/4″ form, with turns spacing of 1 wire diameter. C6 is a gimmick capacitor which has value about 1 pF.

Simple Magnetic Pre-Amp Circuit

This is a simple design for pre amp. But in this design, it can be used for magnetic pickup for record players. The circuit based on uA741 IC that is used as an AC coupled non-inverting amplifier operating on a single supply. The figure of the circuit is shown in below;


The operation of the circuit is the amplifier gain is decided by the feedback components in which C2 controls the low frequency roll-off characteristics while C4 reduces the gain at high frequency end to compensate for the pickup characteristics.R3,R4 and R5 form a voltage divider to give a bias of about half the supply voltage to the non-inverting of uA741.The output at pin6 therefore stands at half the supply voltage.R5 and C3 form a supply line filter to reduce the hum level ans also to eliminate “growling” in case the preamplifier circuit is operated on a common supply with other circuits.

In this circuit, there are notes for attention. First, the circuit is assembly on a good quality PCB or common board. Second, mount the IC1 on an IC base. The circuit can be powered from a 12V battery or 12V DC power supply. Up to 24 V DC can be given to power the circuit. I prefer 12 V DC. Mono sockets can be used to connect the input and output.

Simple TRIAC Crowbar For AC Or DC Lines

A TRIAC Crowbar circuit which works for both AC and DC voltage is shown in the schematic diagram below. This circuit is provide overvoltage protection for electronic or electrical equipment against excessive supply voltage.  Crowbar circuit provides two level of protection. 

First, this protection circuit will drop the voltage across the protected equipment to near zero by shorting the voltage, and second, the circuit will blow the fuse since it short the current. This is the figure of the circuit;

Using the values for R2, R3 and R1 as shown in the schematic diagram, this circuit can operate within range of 42 to 84 VAC or 60 to 120VDC. R2 set operating point where the crowbar will be triggered. To be safe, the TRIAC voltage rating should be greater than that triggering point, actually it should handle the highest possible voltage exposure. To accommodate testing, when we need to check if the crowbar action is triggered without blowing the fuse, a testing switch is provided (normally closed push button). An alarm unit can be added in parallel with the lamp for audible indication in testing crowbar action. [Circuit diagram source: seekic.com]

Simple Ham Radio Circuit Audio Filter Using 741 IC

Here’s a design circuit that has function that it will help to filter out the interference signal and ensure that the signal received from the Morse code station stand out. This is the figure of the circuit;

The earliest mode of radio communications is the use of Morse Code on a continuous wave carrier(CW) which is interrupted to generate a dit and dah in forming an alphabet. Component: 741 IC, Resistor, Capacitor, Battery, Inductor, Switch.[Circuit diagram source: electronics-project-design.co]

LM380, Simple 2 Watts Audio Amplifier Circuit

Small audio amplifier is useful for audio troubleshooting or simple audio projects. It should be a low cost and easy to build. Using integrated circuit for this purpose is the right choice. This is the figure of the circuit;

With LM380 audio amplifier integrated circuit, 2 Watts power can be delivered. For better thermal endurance, a large copper track can be printed in the board to provide heat sinking, this copper track should be soldered to pins 4, 3, 10, 5, 12 and 11.

AF/RF Signal Detector Circuit Using TDA2822 IC

Here’s a design circuit for AF/RF Signal Detector Circuit Diagram. This circuit based on the TDA2822 IC. This is the figure of the circuit;

 

 

This circuit has features: very neat and easy to make, the loudspeaker is in use 4 ohm & 500mW.used to detect the signal does not AF / RF,  cheaper cost, low power stereo amplifier in 8-pin mini-DIP IC, output power up to 250 MW. Component: Switch, Capacitor, Resistor, Transistor, Speaker, Diode. [Circuit diagram source; circuitdiagram-schematic.com]