EP001 is a beginner kit with little or no previous knowledge of electronics. Basic soldering techniques required for circuit board assembly. It comes with two sets of flashing circuit and sound circuit, and soldering tools including a soldering iron, cutting pliers and a soldering base. This will make learning electronics easy and fun! Just follow our manual and build exciting projects. You can even play electronic games with your friends. Enjoy hours of educational fun while learning about electronics.


Key Features:

• A simple two LED flasher
• An ambulance siren
• A soldering iron
• Cutting pliers
• A soldering base

A small, low cost, low wattage amplifier kit. Assembly is required!

Key Features:

• Suitable for 2w. micro cassette player, 3-12 vdc power supply.
• This is an all purpose OTL, circuit.
• Power supply 3 - 12V.
• 3vDC = 200mW 4 ohm speaker 6vDC = 750mW 4 ohm speaker 9vDC = 1.6W 4 ohm speaker 12vDC = 2W 8 ohm speaker

Additional Information:

• On board PCB trim pot style input level adjust
• Based on the TBA820 8 pin DIP
• Power supply can range anywhere from 3V - 12V DC
• The speaker shares a common ground connection
• Dimenions: 1 5/8 X 1 3/8 X 3/8" (41 x 35 x 10mm)
• Click here to view the circuit diagram

A tiny low cost 2 watt stereo amplifier kit. Assembly is required!


Key Features:

• Suitable for 2+2w.portable radio, 3-12 vdc power supply.
• This is an all purpose OTL, circuit.
• Power supply 3 - 12V.
• 3vDC = 200mW 4 ohm speaker 6vDC = 750mW 4 ohm speaker 9vDC = 1.6W 4 ohm speaker 12vDC = 2W 8 ohm speaker

A mono power amplifier kit using an IC with 8 Watts output. This kit amplifies a line signal from a CD player, radio, etc. Assembly is required!


Key Features:

• Suitable for 8W , 8+8W tuner radio or audio tape application generally sound in car radio system.
• Power amp 8w, with only a single particular IC.
• Power amp 8w ,use TDA 2004 as an amplifier for both left and right channel.
• Power supply 12V.

A stereo 8 watt line amplifier kit that uses an IC, and provides 8 watts to each channel! For use with 4 to 8 ohm 8 watt speakers. Assembly is required!


Key Features:

• Suitable for 8+8W tuner radio or audio tape application generally sound in car radio system.
• Power amp 8+8w, with only a single particular IC.
• Power amp 8+8w ,use TDA 2004 as an amplifier for both left and right channel.
• Power supply 12V.

Additional Information:

• Click here to view the circuit diagram

A low cost BTL amplifier kit. Provides 15 watts. Runs on 12vDC. This kit amplifies using an IC. Assembly is required!


Key Features:

• Suitable for 15w. cassette tapes and car radio amplifying.
• Can be installed for home use by using an adapter.
• Power supply 12 V.

A small stereo amplifier kit. Provides 15 watts of power to each channel. Runs on 12vDC. This kit is good for amplifying from CD or other line level audio signal. Assembly is required!


Key Features:

• Suitable for 15+15w. cassette tapes and car radio amplifying.
• Can be installed for home use by using an adapter.
• Power supply 12 V.

A mono power amplifier kit with microphone input with pre amp, tone control, and two input selection. 12vDC 1 Amp max. 15 Watts RMS at 4 ohm BTL. Assembly is required!

Key Features:

• This amplifier is constructed with the TDA 2004 IC.
• Capable of delivering 15 Wrms At 4 Ohms (BTL).
• With have build-in mono tone-control and pre-amplifier of microphone.
• Two inputs selection can be operated using PUSH-ON PUSH-OFF switch.
• Power supply : 12 VDC / MAX 1A.

Additional Information:

• 15 Watts RMS at 4 ohm BTL (bridge tied load), aprox 7 Watts into 8 ohms. Do not connect either speaker terminal to ground this will result in a damaged audio amplifier IC.
• Aux stereo input combines left and right channels into one mono signal. Has a microphone or line input selection switch. Mic input has its own level adjust control. Includes Bass and treble control as well as a volume control. Will operate from 10 volts DC up 15 volts DC.
• Heatsink measures 55mm x 35mm high x 20mm thick or 2 1/4 inchs by 1.5 inchs by 3/4 of an inch thick.
• PCB measures 105mm x60mm or 4 1/8 of an inch by 2 1/4 inchs.
• The shafts on the pots stick out 15 mm or 5/8 of an inch. 4 mounting holes are provided at each corner.

This tone control (Mono) circuit is a multifunctional tone controller that can be applied with normal amplifier. It requires 6-15V power supply. Assembly is required!


Key Features:

• Suitable for use with all types of mono amplifier.
• Power supply 6-15v.

This tone control (stereo) circuit is a multifunctional tone controller that can be applied with normal amplifier. It requires 6-15V power supply. Assembly is required!

Key Features:

• Suitable for use with all types of stereo amplifier.
• Power supply 6-15v.

This super tone control (mono) circuit need 15-0-15V power supply which is suitable for connecting with OCL amplifier only. Assembly is required!


Key Features:

• For OCL monoamplifier.
• Requires 15-0-15 v. power supply.

This super tone control (stereo) circuit need 15-0-15V power supply which is suitable for connecting with OCL amplifier only. Assembly is required!


Key Features:

• For OCL stereo amplifier.
• Requires 15-0-15 v. power supply.

This circuit for the mono respectively that will provide you will a high quality sound system at a very low cost. It needs 12V power supply. Assembly is required!


Key Features:

• This circuit for mono will provide you with a high quality sound system of a very low cost.
• Power supply 12V.

This stereo circuit will provide you with a high quality sound system at a very low cost. It needs a 12V Power Supply. Assembly is required!


Key Features:

• This circuit for stereo will provide you with a high quality sound system of a very low cost.
• Power supply 12V.

A simple circuit that preamplifies a microphone signal. This kit is a basic circuit with 2TR and couple of other essential parts especially designed for microphone. Power supply 12V DC. Assembly is required!

Key Features:

• A basic circuit with 2TR and couple of other essential parts especially designed for microphone.
• Power supply 12V.

Additional Information:

• Click here to view the circuit diagram

A small circuit with an onboard condensor mic and preamp. Be careful not to overheat any of the parts, as the components involved in this one are sensitive. Assembly is required!

Key Features:

• This circuit is small and has only few components because this circuit has PRE-MIC condensor.
• It is high sensitivity than normal circuit.
• Power supply 6-9V.

Additional Information:

• Click here to view the circuit diagram

If your OCL amp has no protection circuit, you could potentially fry your speaker, unless you use something like this. Assembly is required!


Key Features:

• For the protection of mono OCL amplifier. if and when there is a short circuit in the transistor output.
• Power supply 12V.

If your OCL amp has no protection circuit, you could potentially fry your speaker, unless you use something like this. Assembly is required!


Key Features:

• For the protection of stereo OCL amplifier. if and when there is a short circuit in the transistor output.
• Power supply 12V.

This circuit simulates stereo by taking a mono signal, and separating certain frequencies to each channel. The Left Channel gets 64Hz, 1KHz, and 4KHz. The Right Channel gets 32Hz, 500Hz, and 2KHz. Great way to spread out your sound. Assembly is required!


Key Features:

• The stereo simulator circuit divides the different frequency to left and right side.
• The left allows the frequency at 64Hz 1Khz and 4KHz. the right lets the frequency at 32Hz 500Hz and 2Khz to go through.
• Power supply 12V.

A circuit of 3 channels to allow signal from 3 microphones plus another point for music to be mixed.Very suitable for practice singing or group conference. Assembly is required!


Key Features:

• A circuit of 3 channels consist of three microphone mixing out the same position.
• It can be applied in singing practice or conversation.
• Power supply 12V.

With 3 frequencies and an amplifiction TR in this mono circuit the increase of londness will be of much higher quality than found in most regular systems which rely on the connection to the tap of the volume. Assembly is required!


Key Features:

• With 3 frequency and an amplification TR for mono.
• It will be of much higher quality than found in most regular system.
• Power supply 12V.

This loudness circuit uses a 3 stage filter and a simple one transistor amplifier to increases bass and tweeter frequencies. This circuit goes in between a line level stage before existing tone control or line level audio output. The output would then go to the power amplifier. The loudness circuit boosts certain frequencies to give better quality sound at a lower volume level. Helps to eliminate stress on your amplifier by not having to drive your speakers too hard. Power supply: Requires 12 VDC. Assembly is required!


Key Features:

• With 3 frequency and an amplification TR for stereo.
• It will be of much higher quality than found in most regular system.
• Power supply 12V.

This video amplifier kit has one input and four outputs, Adjustable gain 1-4 dB, Input and output impedance 75 ohms, Power supply 12 VDC. Assembly is required!


Key Features:

• Has one input and four outputs.
• Adjustable gain 1-4 dB.
• Input and output impedance 75 ohms.
• Power supply 12 VDC.

Amplifies a mono signal to 30 watts using 1% metal film resistors. This OTL circuit is without tone control. OTL (Output Transistor-less) This kit requires a 40 - 50 VDC center tap transformer 31 - 0 - 31 or 33 - 0 - 33 at 1.5 Amps. The manufacturer recommends two IN5401 diodes and a 3300uF 50V cap as rectifier section. Being an OTL circuit, the speaker is protected if the output transistor is shorted. 12V output for Tone Control. Assembly is required!


Key Features:

• This OTL circuit is without tone control function.
• No problem regarding burning speaker, concern when output of transistor is shorted.
• This circuit needs 40 – 50 V. Power supply with 31-0-31 or 33-0-33 V.
• 1.5A. Transformer for FK656, 3A. Transformer for FK657.

An OTL circuit with no tone control. Amplifies a line signal to 30 watts times two channels. Stereo sound with 1% resistance. Takes 40 - 50 volts, a 3 Amp transformer. Assembly is required!


Key Features:

• This OTL circuit is without tone control function.
• No problem regarding burning speaker, concern when output of transistor is shorted.
• This circuit needs 40 – 50 V. Power supply with 31-0-31 or 33-0-33 V.
• 1.5A. Transformer for FK656, 3A. Transformer for FK657.

35 Watt mono amplifier circuit with input sensitivity 1V., and input impedance 15K, with complementary class AB circuit type. Can be used for super tone control circuit. Power supply : 35 VDC. Assembly is required!


Key Features:

• This circuit is the main amplifier circuit with input sensitivity 1V., and input impedance 15K, with complementary class AB circuit type.
• Can be used for super tone control circuit.
• Power supply : 35 VDC.

35 Watt stereo amplifier circuit with input sensitivity 1V., and input impedance 15K, with complementary class AB circuit type. Can be used for super tone control circuit. Power supply : 35 VDC. Assembly is required!


Key Features:

• This circuit is the main amplifier circuit with input sensitivity 1V., and input impedance 15K, with complementary class AB circuit type.
• Can be used for super tone control circuit.
• Power supply : 35 VDC.

50 Watt Mono OCL Power Amplifier Kit 1% Resistors. Class AB circuit, 1V. input sensitivity and 15 K input resistance. Power supply : 24-0-24V. Assembly is required!


Key Features:

• This is a complementary class AB circuit main amplifier.
• 1V. input sensitivity and 15 K input resistance.
• Power supply : 24-0-24V.

50 Watt OCL R1% Power Amplifier Kit. Class AB circuit, 1V. input sensitivity and 15 K input resistance. Power supply : 24-0-24V. Assembly is required!


Key Features:

• This is a complementary class AB circuit main amplifier, with condenserless output.
• 1V. input sensitivity and 15 K input resistance.
• Power supply : 24-0-24V.

This circuit is a class AB 100 watt mono power amplifier circuit with input sensitivity 1Vrms, input impedance 20kW, Frequency response 10 to 100kHz (+/- 1dB), and total harmonic distortion 0.02%. Power supply : Dual 50VDC. Assembly is required!


Key Features:

• This circuit is a power amplifier circuit with input sensitivity 1Vrms, input impedance 20k
• Frequency response 10 to 100kHz (+/- 1dB), and total harmonic distortion 0.02%.
• Using a circuit the end stage is always set to class AB.
• Power supply : Dual 50VDC.

This circuit is a class AB 100 watt stereo power amplifier circuit with input sensitivity 1Vrms, input impedance 20kW, Frequency response 10 to 100kHz (+/- 1dB), and total harmonic distortion 0.02%. Power supply : Dual 50VDC. Assembly is required!


Key Features:

• This circuit is a power amplifier circuit with input sensitivity 1Vrms, input impedance 20kW
• Frequency response 10 to 100kHz (+/- 1dB), and total harmonic distortion 0.02%.
• Using a circuit the end stage is always set to class AB.
• Power supply : Dual 50VDC.

Preamplifies the signal coming in from a tape player's head! Assembly is required!


Key Features:

• Frequency range : 20 Hz to 20kHz. Max. output signal : 880 mVrms.
• Tape head impedance : 100 Ohms to 600 Ohms.
• Power supply : need transformer 2 X 12 VAC / 500 mA.

Amplifies 25 to 200Hz frequency range! Great for subwoofer experimentation. With an input sensitivity of 1 Vrms with an impedance of 100 Kohms, and an output power of 48W RMS class AB in 4 or 8 Ohm. Take approximately 35vDC. Requires a power supply capable of delivering 2 amps plus and minus 25 to 35 volts DC. Power supply is not included. Assembly is required!


Key Features:

• This circuit is the main amplifier circuit for low frequency with bandwidth frequency : 25 to 200 Hz.
• Input sensitivity : 1 Vrms. , Input impedance : 100 Kohms, And Output.
• Power : 48 Wrms class AB in 4 or 8 Ohm.
• Power supply : +/- 35VDC.