Hi, my name is Emilio from Mexico. Thanks for accepting me in the forum, and sorry for write in english i dont know russian languaje. I love your club and your experiments. I wanna share one version of curumin transceiver from PY20HH:






I dont have a crystal socket so make one with two small pieces of wood and tin from deodorant spray:


Here is the complet circuit i use shunt voltage regulator integrated TL431 like audio amplifier:


The output voltage with 50 ohms load is about 3 volts, calculate the power about 180mw.


72!!

Hi,Emilio! Very interesting information, thanks! We will be glad to see You on the forum.

Dear Emilio, thanks for your radio presentation ,hopes to hear your signal and qso will occur!
In qrp we trust!

Dear Emilio, welcome!

Dear Emilio, thanks for start the interesting topic! I enjoy the simplest radios very much. Years ago I assembled Pititico TRX by PY2OHH with 3200 Ohms phones but no one result in RX mode. Next, I add audio amplifier LM386 and a lot of stations was copied as "pile-up" stile, BC and HAM heard at once.
Эмилио, спасибо за интересную тему! Я очень люблю простейшие конструкции. Несколько лет назад я пробовал трансивер PY2OHH Pititico с наушниками 3200 Ом, но никакого приема не була. Добавив УНЧ на LM386 услышал множество радиостанций одновременно, как вещательных, так и любительских. The same so trcvr designed by HA4OO. I tried it also but no success in RX.
Аналогичная конструкция трансивера HA2OO. Я пробовал ее, но также без успеха на прием. Similar trcvrs available at G3XBM (Chirpy, XBM-series) and other designers.
Подобные конструкции есть также у G3XBM (Chirpy, серия XBM) и у других конструкторов Emilio, I'm happy to subscribe to your topic, it's interesting so much and must be to continued. GL for you!
С удовольствием подписываюсь на эту тему, это очень интересно и должно иметь продолжение. Успехов!

Hello, dear Emilio! Very amazing and non-standard idea to use TL431 as audio amplifier!

It is very interesting to hear how the receiver of your TRX sounds. Do you have the opportunity to make a record, please?

I make the record and share.... the amplifier work amazing.

There is the audio recorder from the curumim transceiver and the TL431 like audio amp with the 7055khz cristal at 00:00 utc aprox.

The distance between my QTH and the CW tx (from USA) is about 1,800 kilometers distance.

sbj.edu.mx/curumim/curumim-7055-mx.mp3

I dont know why is this "mmmm" sound, perhaps some impedance problem between the transistor oscillator and the Audio Amp.

My sound recorder is a Sony ICD-UX200, my antenna is a long wire about 20 meters and 10 meters tall.

72

Thank you very much for audio, dear Emilio! I think, the "mmmm" hum (noise) occurs due to the arrival part of the oscilator signal at the antenna input. Anyway, it's very interesting. Emilio, are you planning to add var cap + inductor in series with xtal to have +/- some kHz VXO?
Большое спасибо за запись, Эмилио! Я думаю, что гудящий шум возникает из-за частичного проникновения сигнала генератора на антенный вход. В любом случае, это очень интересно. Эмилио, ты планируешь добавить КПЕ с катушкой последовательно с кварцем для небольшого изменения частоты?

Hi, i try put a 1n4007 silicon diode like varactor but no have more space for the potentiometer perhaps tomorrow "reuse" old TV and extract some small pots...

72