Dwutranzystorowe głośnikowe radyjko na fale średnie

This two transistor AM radio circuit is also called “miniradio”. It uses only 2 transistors and few
passive components which makes is very easy to be constructed. Although the circuit is very simple,
it functions very well without external antenna or ground connection. The transistor T1 works as a
feedback regulated HFamplifier and function as demodulator at the same time. The sensitivity of the
receiver is dependent on the amount of feedback and can be adjusted by P1.

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Two transistor AM radio receiver circuit

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Transistor radio circuit schematic

The demodulated signal comes out from the collector of T1. The signal is then filtered by C3 so that
only the audio signal will be amplified by T2. The amplified signal is then delivered to a high
impedance “earphone”. The coil is 65 turns AM antenna wire around a 10 cm long x 10 mm diameter
ferrite rod. The tap is at the fifth turn of the coil counting from its ground end. The coil must be
installed as close as possible to the PCB.

The sensitivity of the radio receiver can be greatly improved by attaching an external antenna into it.
The external antenna must be coupled to the hot end of the coil through a 4.7 picofarad capacitor. The
radio receiver cand be powered by a 9 volt battery. It consumes only 1 mA.

2 transistor radio PCB layout

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Two transistor AM radio receiver circuit

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Transistor radio parts placement layout

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8 Responses to “Two Transistor AM Radio Receiver”

Htunhlin says: on

November 12, 2009 at 8:00 pm

It is very good presentation!

Christian says: on

March 10, 2010 at 9:41 am

Will this work?

Th3_uN1Qu3

says: on

March 11, 2010 at 1:05 am

Um, build it and find out. By the looks of it it’s a scan from an old electronics magazine, so it
should work. In case you haven’t figured, this is an AM not FM radio, so depending where
you live you’ll either get lots of rstations (in the US), or three stations (such as here in
Romania).

unni says: on

December 1, 2010 at 7:29 pm

how can i make this type pcb

wyatt says: on

March 27, 2011 at 4:56 pm

Dont expect good performance, this radio will pick up locals and locals only. This is a

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Two transistor AM radio receiver circuit

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regenerative reflex receiver and you may have issues with unwanted feedback, even with the
regen control all the way down like I did. Otherwise this is a great circuit and it uses no
transformers or chokes which makes it easy to build in tight areas.

Eric says: on

September 24, 2011 at 12:07 am

Hi, I was wondering if you could provide terminal (emitter, base, and collector) voltages you
measured (or calculated) for the 2 transistors. It would be very helpful to me. Thank you!

deepk says: on

April 11, 2012 at 1:16 pm

2sc3112 2sc2675 Equal to transistor ?????

Alex says: on

July 5, 2012 at 11:14 am

Thought, any general purpose NPN transistor, like BC547, 2N4401 etc… For using the PNP
transistors its only needed to reverse the polarity of the battery and electrolityc capacitors.
Good luck!

PS Its an old, good and simple schematic will work for sure

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