Mohican Product Detector

Pentagrid Converter

Norwich Avenue Fresno, California Improve the performance of your receiver on SSB and CW with this simple transistor product detector. All receivers not specifically designed for SSB reception suffer, to some extent, in quality and ease of tuning when used for this mode. I istoition of the received signal occurs for a number of reasons. When this includes BFO pulling, reduction of the rf gain may prove necessary. This in turn leads to loss of sensitivity and does...

Simple Transistor Push Pull Speaker

Amplifier Exhibits Two

Fig. 20- This complimentary amplifier provides up to 220 mW output with a frequency response from 90 Hz to 12.5 kHz. Although matched transistors are not required for Q2 and Q3t they are available as the 2N2707. in the preamplifier. Resistive pads may be used to increase the input impedance, but they greatly reduce stage gain and increase problems with signal to noise ratios. In the amplifier of Fig, 19 equalization is obtained by a frequency selective feedback path between the collector and...

Germanium Transistor Oscillator Crystal Circuit

Tuned Collector Oscillator

Fig, 28, 25 watt modulator uses readily available commercial transformers. Transistors QI and Q2 are 2NII72, 2N301, 2NI560, SK3009, GE-9 or HEP-232 Q3 and Q4 are 2N 74t 2N278, SK3012, GE-4 or HEP-233 The frequency response ol this circuit is quite good and is essentially flat from 200 Hz to 7 kHz. If you are interested in building a dual conversion receiver for single channel operation on MARS, 2 meter F 1 or WWV, the single oscillator circuit which provides two outputs illustrated in Fig. 29...

Audio Signal Tracer Circuit

Radio Repair Signal Tracer Circuit

Th s signal tracer provides more than adequate audio output with only J00 microvolts of modulated rf at the input. It may also be used for tracing audio circuits, but don't depend on its fidelity. All the transistors are germanium types such as the 2N404, 2NI450, 2N2953, SK3004,, GE-2 or HEP-253 the diode in the probe is a IN34A or IN67A or similar. i ier to t beck microphones and preamps and to detect noise and hum in amplifiers. The signal tracer shown in Fig. 57 uses a push pull...

Amateur Radio Radio Amateur 03-1967 Mohican Product Detector

100 Khz Crystal Calibrator

With the values shown in the schematic, this circuit provides gains of 3, 10 and 30, which extend the 1.5 volt scale of the VOM to 500, 150 and 50 millivolts lull scale. There are two zero controls which must be adjusted when using this unit first the 500 kilohm pot HI in the base bias lead to transistor QI is adjusted to zero the output with no input and the base isolated from ground. The 1.5k zero adjust pot R2 is then adjusted for an output zero with the input leads shorted...