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Jen HF Modulator

Based on the Jen HF Modulator· 5 other boards clone it

Schematic

Check before you build · 1 value the reader of this schematic was not sure of

input variable resistor: no value drawn beside it; the '33k' label sits between it and a fixed 33k to ground

Ref	Value	Normalized	Type	Notes
Resistors 10
×2	33k	33k		one input to ground, one in parallel with the 0.01uF from the input pot to ground; read from the schematic by eye
×1	560k	560k		Q1 base bias; read from the schematic by eye
×2	100k	100k		one from Q1 emitter, one across the Speed pot; read from the schematic by eye
×1	12k	12k		Q1 collector; read from the schematic by eye
×1	1.2k	1.2k		Q1 emitter; read from the schematic by eye
×1	220k	220k		Intensity wiper to oscillator; read from the schematic by eye
×1	18k	18k		oscillator collector; read from the schematic by eye
×1	2.2M	2.2M		oscillator bias; read from the schematic by eye
×1	10k	10k		read from the schematic by eye
×1	2.2k	2.2k		in series with Speed pot; read from the schematic by eye
Capacitors 6
×1	3300pF	3.3n		input; read from the schematic by eye
×1	0.01uF	10n		read from the schematic by eye
×3	0.22uF	220n		read from the schematic by eye
×2	0.0022uF	2.2n		read from the schematic by eye
×1	0.1uF	100n		across the modulating transistor; read from the schematic by eye
×3	0.047uF	47n		phase-shift oscillator; read from the schematic by eye
Transistors 1
×3	2N5172	2N5172		NPN: input stage, modulating transistor, phase-shift oscillator; read from the schematic by eye
Potentiometers 3
Intensity	100k	100k	Potentiometer	read from the schematic by eye
Speed	100k	100k	Potentiometer	read from the schematic by eye
×1	?	?	Potentiometer	input-side variable resistor with no value of its own; the nearby 33k label may belong to it; read from the schematic by eye