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This twin-T oscillator with amplifier operational produces signals in a banda of frequencies that depends of component values
used. Next to the diagram is the formula that is used to determine the component values in function of frequency. The source must
be symmetric with voltage between 9 and 15V.
This mixer employs an amplifier operational at the input FET (Texas Ins.) And has excellent gain determined by resistor
of 150k in the feedback circuit. Were designed only two inputs, but can be increased its number until 10 without problems. the resistors are 1/8W and input connections and output must be shielded.
This little amp has a input stage low impedance for use as input for speakers used as microphones. It can be used as an intercom.
Terminals 3 and 4 are input and the 1 and 2 output, so that by a key can be switched the functions of the seasons. Due to the low impedance of the line, stations should not be separated for over 20 m of wire.
The gain of this amplifier stage audio is 1000 and is given by the relationship of values between the resistor
feedback and the input resistor R1. Output is low impedance (about 50 ohm) and the input has an impedance
determined by R1. The power source must be symmetric.
This amplifier of great sensiblity can be exploited in intercoms, output stages of radios, alarms and more. Their food is made
with voltages between 6 and 9 V, with whose power output is between 0.5 and 1W. The loudspeaker 4 or 8 ohm and electrolyte are for voltages work a little larger than the supply voltage.
The noise produced by a tiny magnetic microphone in the water, seem which attracts several species of fish. The low impedance Magnetic microphone can be coupled in the form mechanics to the top of a bottle, used as ballast, which is immersed in the place where you want to fish. the transformer T1 is output for transistors with an impedance between 200 and 2000 ohm and frequency adjustment of the operation (which is obtained experimentally) is effected with P1.
