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 Post subject: AM with IN4148 double balanced mixer
PostPosted: Jul Mon 26, 2021 6:29 am 
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Joined: Mar Thu 01, 2018 1:30 am
Posts: 734
Old note. Circuit was tested and worked fine. The DBM generates the sidebands and the carrier is introduced by a -16dB resistive pad feeding the emitter of the transistor buffer amplifier. The AM generated was high fidelity and 100% modulation was obtained. Output power was low. A 5 feet of wire acted as an antenna and the signal covered my small room. Transistor buffer current = 5ma (< 100mW DC). Ft of C3199 is 100MHz. A 2n2222 will work just fine. If I remember correctly I used a BN 43 - 202 ferrite binocular core to wind the coils. This circuit is broadband and will generate AM from 500KHz to 30MHz.

Sharing FYI.


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 Post subject: Re: AM with IN4148 double balanced mixer
PostPosted: Jul Mon 26, 2021 9:01 pm 
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Joined: Jun Sun 15, 2014 5:37 pm
Posts: 1396
Location: Montreal, Quebec
Unbalance the mixer, and the carrier feeds through.


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 Post subject: Re: AM with IN4148 double balanced mixer
PostPosted: Jul Mon 26, 2021 9:19 pm 
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Joined: Mar Thu 01, 2018 1:30 am
Posts: 734
mblack wrote:
Unbalance the mixer, and the carrier feeds through.


Yes. This ckt needed no adjustments.


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