Enclosure not stated · 3 knobs

Maestro RingMod

Based on the Maestro RingMod

Category: Ring Mod / Synth· Ring Modulators and Frequency Shifters
Controls: Volume · Pitch · Modulation
Price: see vendor
Tags: Ring Modulators and Frequency Shifters

Open the schematic at Experimentalists Anonymous

Schematic

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Parts list 42 rows

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Check before you build · 2 values the reader of this schematic was not sure of

18K: the resistor feeding 1495 pin 4 could read 10K
Pitch: dual-gang reading from the dashed box

Ref	Value	Normalized	Type	Notes
Resistors 13
×5	1K	1k		input, squelch rectifier, mixer, two in the supply; read from the schematic by eye
×11	10K	10k		read from the schematic by eye
×11	47K	47k		read from the schematic by eye
×1	5.1K	5.1k		read from the schematic by eye
×9	4.7K	4.7k		read from the schematic by eye
×3	100K	100k		read from the schematic by eye
×2	18K	18k		one at the Modulate switch, one feeding 1495 pin 4; read from the schematic by eye
×7	3.3K	3.3k		1495 load and null networks; read from the schematic by eye
×1	2.7M	2.7M		offset adjust feed; read from the schematic by eye
×1	270K	270k		oscillator; read from the schematic by eye
×2	150Ω	150		supply; read from the schematic by eye
×1	470Ω	470		+12V dropper; read from the schematic by eye
×1	390Ω	390		-12V dropper; read from the schematic by eye
Capacitors 7
×4	20uF	20u		electrolytic, 16V; read from the schematic by eye
×1	200pF	200p		read from the schematic by eye
×1	.33uF	330n		drawn .33µf at the input jack; read from the schematic by eye
×4	.15uF	150n		drawn .15; two in the oscillator range switching, two supply bypass; read from the schematic by eye
×2	.015uF	15n		drawn .015; oscillator range; read from the schematic by eye
×2	160uF	160u		electrolytic, 25V; read from the schematic by eye
×2	125uF	125u		electrolytic, 16V; read from the schematic by eye
Diodes 4
×3	1N4148	1N4148		read from the schematic by eye
×2	1N746	1N746 / 3V3		zener, oscillator amplitude limiting; read from the schematic by eye
×4	1N4002	1N4002		bridge rectifier; read from the schematic by eye
×2	1N965	1N965 / 15V		zener, supply reference; read from the schematic by eye
Transistors 3
×1	2N4860	2N4860		JFET, squelch switch; read from the schematic by eye
×2	2N3566	2N3566		positive regulator; read from the schematic by eye
×2	2N3638A	2N3638A		negative regulator; read from the schematic by eye
ICs 3
×2	1458	1458		dual op amp, four sections; read from the schematic by eye
×1	741	741		oscillator; read from the schematic by eye
×1	1495	1495		MC1495 four-quadrant multiplier; read from the schematic by eye
Potentiometers 3
Volume	A50K	A50k	Potentiometer	drawn 50K audio; read from the schematic by eye
Pitch	50K	50k	Potentiometer	drawn as a dual-gang pot (two wipers in a dashed box); read from the schematic by eye
Modulation	B50K	B50k	Potentiometer	drawn 50K linear, disconnected by the modulation pedal input jack; read from the schematic by eye
Trimmers 5
Linear Squelch Adjust	5K	5k		read from the schematic by eye
Osc Adjust	5K	5k		read from the schematic by eye
Carrier Null Adjust	5K	5k		read from the schematic by eye
Signal Null Adjust	5K	5k		read from the schematic by eye
Offset Adjust	5K	5k		read from the schematic by eye
Switches 3
Modulate	SPDT	SPDT		effect/bypass to the amp jack; read from the schematic by eye
Pitch Range	DPDT	DPDT		two poles linked by a dashed line; read from the schematic by eye
Power	SPST	SPST		mains switch with neon indicator; read from the schematic by eye
Other 1
×1	1A	1A		mains fuse, drawn 1 AMP; read from the schematic by eye