2N3055 circuits
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12 Volt Inverter for Soldering Iron
Nov 3rd
Here is a simple 12 V inverter for using a small soldering iron (25W, 35W, etc) in the absence of mains supply. It uses eight transistors and a few resistors and capacitors. Transistors T1 and T2 (each BC547) form an astable multivibrator that produces 50Hz signal. The complementary outputs from the collectors of transistors T1 and T2 are fed to pnp Darlington driver stages formed by transistor pairs T3-T5 and T4-T6 (utilising BC558 and BD140). The outputs from the drivers are fed to transistors T7 and T8 (each 2N3055) connected for push-pull operation. Use suitable heat-sinks for transistors T5 through More >
2N3055 datasheet
Oct 31st
2N3055 is a single diffused NPN silicon transistor in TO 3 case. The collector is electrically connected to the case. The 2N3055 transistor is particularly suitable for use in powerfull AF output stages and in stabilized power supply units. (more…)
2N3055 24 Watt Class A Amplifier
Oct 28th
This a 24 Watt Class A Amplifier circuit made from discrete semiconductors like 2N3055. This audio amplifier can drive up to 24W Class A into 8 Ohm speaker with an audio bandwidth of 100mHz to 100kHz flat. The input power is 305mV for 24W output into 8 Ohm (33dB gain) and the THD is very low. (more…)
Audio power amplifier 60W with 2N3055
Oct 18th
This is a simple 60W class B power amplifier. This audio amplifier can work from 30 to 60V with the maximum input voltage around 0.8 – 1V. It is built with the well known 2N3055 and can deliver up to 80W on a 4Ω speaker. (more…)
50V 2A power supply circuit design – adjustable
Oct 8th
LM10 makes this 50V power supply a quality one. With 2 LM10 we can build a short circuit protected power supply, with adjustable output voltage and current. The output voltage increases linear with P1 and P3 adjust the current. P2 is used for adjusting the maximum output current (2A). This 50V power supply has a minimum output voltage arround 0.4V and maximum 45V. For 50V the main transformer is 42V / 2A, C5 = 4700uF / 80V, T4 = BF257, T6, T7 = BD245B . R12 has 470Ω / 5W. If a short circuit appears the final transistor wont burn if More >
Adjustable power supply 0 – 30V / 1A
Sep 29th
This power supply deliver a cc voltage adjustable between 0 and 30V , a current intensity of 1A and has a built in programmable current limitation. The output current can be adjusted with P3. Power supply first use adjustment: Load the output with a 1k / 1W resistor, rotate P3 at minimum and adjust P2 untill his cursor is next to the + output voltage line. With P1 bring the output voltage to 0. If the adjustment domain of the P2 potentiometer does not reach 30V, lower R6 value. (more…)
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