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17% OFF Seven AM Radio Electronic DIY Kit Kit de aprendizado eletrônico 6,97€ 8,36€ View It

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thehobe 26/09/2016

I built this device in a couple of hours but am dissatisfied with the finished unit. The batteries do not fit properly and pop out their position due to the battery contacts. I had to glue in some foam to properly hold the batteries. The soldering of the antenna wires is quite difficult --even with my 35 years experience as an Analog design engineer with massive experience in building projects. The location of the IF transformer coils requires you to translate chinese symbols on the schematic using the internet but even then, The first IF coil slug is black and not red as some websites show in pictures of the completed unit. There are several websites mixing up the white and yellow IF cans. The proper placement is: B2-black, B3-White, B4-yellow, and B5-Green---at least that is what the schematic says. My radio worked but it is not an example of a good AM radio. You can listen to the ball game on it but don't expect much more. The amplifier transformers are also not identified on the schematic--I used the green as the first or primary transformer, B6 and red as the output transformer, B7. I built the circuit just to have a little fun as I am retired now (but not very old). AM ferrite antennas are very directional. The tuning dial "needle" sticker is VERY basic and unattractive. I think you are better off buying a working, old transistor radio from Ebay for better fit and finish if you want better tuning, sound and battery retention. I did like the use of two AA batteries over the traditional 9V battery for cost and availability. That is actually one of the key reasons I purchased this radio.

Comentários (2)

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MARECHAL HelloNormally code colour of transfo IFT is the following one: IFT1: Yellow IFT 2: White and IFT3: Black moreover measure the resistance of bobin... The black in the secondary has less turns. If you invert the IFT, it can work but badly. (Not enough sensibility.)For the bo oscillator, generally it is red... But once.. Green. Damage that he have there no indication on shield case such as; OSC, IFT1 , IFT2 and IFT3. For the transfo of output , the secondary has very low resistance... ( HP
Resposta 18/02/2018

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tholl Theschematic says B2-RED, B3-Yellow, B4-WHITE, B5-BLACK. One can download Google Translate and point it at the parts list. B6 is BLUE GREEN, B7 is YELLOW RED (really YELLOW BLUE).
Resposta 26/03/2021

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Nossa Empresa

Entre em contato conosco

Pagamento & Envio

Programas de Parceria

Sobre a Banggood.com garantias e política de devolução Termos de uso Política de Privacidade Reivindicação de Propriedade Intelectual Mapa do site

Entre em contato conosco Guia do Usuário Novo Central de ajuda Assuntos Especializados

Métodos de pagamento Guia de Transporte Locais para onde enviamos Tempo estimado de entrega Instrução de BGpay

Programa de Fashion Blogger Programa de Afiliados Programa de Atacado Entrega direta clube de revisão