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simple radio beacon with mod'
http://www.vk6fh.com/vk6fh/simple%20radio%20beacon%20mod.htm
The only audio oscillator that will run on a (low) 1.5V supply seems to be: the cross-coupled (Eccles-Jordan) multivibrator type. Must be constructed with discrete components. No IC's (555, Op-Amp, TTL, CMOS etc) will run at 1.5Volt Output is a "square wave" With circuit values shown freq' is approx 600Hz. (see formula)
Easy 1.5V to 12V/24V Converter Circuits
https://makingcircuits.com/blog/easy-1-5v-to-12v-24v-converter-circuits/
Easy 1.5V to 12V/24V Converter Circuits. This circuit is basically a step-up DC-DC converter, which permits to acquire 15 volts of output originating from an ordinary 1.5 volt (B1) battery without necessitating the use transformers or customized integrated circuits. The very center of the circuit is undoubtedly an oscillator, created close to a ...
6 Useful Voltage Controlled Oscillator Circuit Explored ...
https://www.homemade-circuits.com/voltage-controlled-oscillator-circuit/
The circuit is constructed around a CD4046B phase-locked loop (PLL) integrated circuit with a built-in voltage-controlled oscillator (VCO). The voltage level at pin 9, value of capacitor C1 between pins 6 and 7, potentiometer R1 setting at pin 11, and potentiometer R2 at pin 12 control the frequency of the VCO.
Simple Oscillator Circuits
https://makingcircuits.com/blog/simple-oscillator-circuits/
The circuit diagram of a CMOS Hartley oscillator is shown in below diagram. This is very identical in functioning to the pierce oscillator which was explained previously, the difference being that a centre tapped L-C circuit is employed …
Audio Oscillators - Electronic Circuits and Diagrams ...
https://www.circuitstoday.com/audio-oscillators
When a phase-shift network such as that indicated in fig. is used in a phase shift oscillator, the R’s and C’s must be selected so as to produce a phase shift of 180° at the desired frequency of oscillation. The output of the voltage amplifier is fed to the input to the phase-shift network. Thus V 1 = V out.
10 to 1000 MHz Oscillator Schematic Circuit Diagram
https://circuit-diagramz.com/10-to-1000-mhz-oscillator-schematic-circuit-diagram/
The VCO is enabled when the voltage on pin 8 is at least +3.0 V. Connecting the feedback capacitors C1 and C2 to pins 3 (FDBK) and 4 (VTUNE) transforms the internal transistor into a Colpitts oscillator. A resonator is also needed; here this consists of …
555 circuits using the 555 Timer as an Astable Oscillator
https://www.electronics-tutorials.ws/waveforms/555-circuits-part-1.html
555 Circuits Part 1. A collection of 555 circuits using the 555 Timer as an astable oscillator with different duty cycles. We have seen in the last few tutorials that the 555 Timer can be configured with externally connected components as multivibrators, oscillators and timers, with timing intervals ranging from a few microseconds to many hours.
Simplest AM Radio Circuit - Homemade Circuit Projects
https://www.homemade-circuits.com/simplest-am-radio-receiver-with-speaker/
Circuit Diagram Parts List for a simple 2 transistor radio receiver with speaker R1 = 1M R2 = 22K R3 = 4K7 R4 = 1K P1 = 4K7 C1 = 104 C2 = 470pF C3,C4 = 10uF/25V T1 = BC547 T2 = 8050 or 2N2222 L1 = ordinary MW antenna coil SPEAKER = small earphone 10k TRIM = ordinary GANG MW Antenna Coil on Ferrite Rod (L1)
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