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Integrated
Circuits

4727BPC  —  Counter
Part # IC4727BPC
IC4727BPC
Click Photo to Enlarge

The 4727B integrated circuit contains seven clocked D-type Flip-Flops.  Each flip-flop's Q output is wired to its Data input so that each operates as a frequency divider.

There are three single flip-flops and two 2-stage flip-flops in the chip, making seven dividers in total.

Including the frequency of the clock, that covers all eight musical octaves.

If the clock frequency is High C, for example, one 4727 chip can produce every other C in the musical spectrum.

ITEM #:  IC-4727BPC
FUNCTION: 7-Stage Counter (Divider)
PACKAGE: 14-Pin DIP
MANUFACTURER: Fairchild Semiconductor
DATA SHEET: 4727B Data Sheet
NOTES: Pulled from socket, tested

PRICE - $29.00 USD each


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Vintage keyboards using the 4727BPC:

ARMON®
  SuperPiano  
CRB
Diamond 712-L Diamond 801 Diamond 902-V
  Diamond 910-M  
CRUMAR®
202 915 920
2002 DS-1 DS-2
MagicVox 2000 Accordion Multiman-S Organizer T-1
Organizer T-2 Roadrunner Roadrunner 2
Roady Stratus T-3
  Trilogy  
ELGAM
  The Entertainer 8  
EMINENT / SOLINA
P200 P240 P245
  P250  
GEM
Caravan F20 F50
H-600 H-3000 Jumbo 61
Rodeo 37 Rodeo 49 Rodeo 61
Wizard 321 Wizard 325  
GEM-GALANTI
H-1000 H-2000 H-6000
  H-7000  
GIANNINI
  Compac-Piano  
HOHNER
  Caravelle 610 De Luxe  
LOGAN®
Caravelle 610 De Luxe Strings Melody Strings Melody II
VISCOUNT
Alfa Alice Astra
Bahia De Luxe / Venus Broadway Music Maker Cabaret
Domus 4 Domus 5 Fantasia
Fantasia De Luxe Hollywood Imperial Super
Odeon De Luxe Orion Oklahoma
Oklahoma Deluxe Piano 7  
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CA3080E  —  Operational Transconductance Amp
Part # ICCA3080E
ICCA3080E
Click Photo to Enlarge

This discontinued OTA is used in a plethora of vintage synthesizers and musical gear.

Transconductance amplifiers have a nifty bias input that can be used for gating applications like sample-hold, multiplexing, and gain-control.

ITEM #:  IC-CA3080E
FUNCTION: Operational Transconductance Amp (OTA)
PACKAGE: 8-Pin DIP
MANUFACTURER: RCA
DATA SHEET: CA3080 Data Sheet
NOTES: New

PRICE - $12.88 USD


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CA3140E  —  BiMOS Op Amp
Part # ICCA3140E
ICCA3140E
Click Photo to Enlarge

This discontinued op amp has the same 8-lead pin-out of industry standard op amps like the 741.

But the 3140 has a pMOS input stage giving it a very high input impedance.

It also has a Strobe input, not found on the 741 familty, that can be used for additional frequency roll-off.

ITEM #:  IC-CA3140E
FUNCTION: Operational Amplifier (MOSFET input / Bipolar output)
PACKAGE: 8-Pin DIP
MANUFACTURER: Intersil
DATA SHEET: CA3140 Data Sheet
NOTES: New

PRICE - Package of 2 chips for $7.98 USD


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CEM3310  —  Envelope Generator
Part # ICCEM3310
ICCEM3310
Click Photo to Enlarge

This discontinued IC generates a four-stage sound envelope (Attack Time, Decay Time, Sustain Level, and Release Time) in response to four analog input voltages, a trigger, and a gate.

ITEM #:  IC-CEM3310
FUNCTION: Voltage Controlled Envelope Generator  (ADSR)
PACKAGE: 16-Pin DIP
MANUFACTURER: Curtis Electromusic Specialties
DATA SHEET: CEM3310 Data Sheet
NOTES: May be New Old Stock or Used (pulled from socket, tested)

PRICE - $88 USD


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Vintage synths using the CEM3310:

CRUMAR®
Trilogy Composer  
DIGISOUND
80-10 VCEG 80-18 Dual MFEG 80-C9 Voice Card
EEH (SSB)
Syntec Banana    
MOOG®
Memorymoog    
OBERHEIM
OB-8 OBX-a OB-1
OB-SX    
PAiA Electronics
Proteus    
SEQUENTIAL CIRCUITS
Prophet 5 Rev 3 Prophet 10 Pro-1
PPG
Wave 2.0    
SYNTON
Syrinx SN1    
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CEM3320  —  Voltage Controlled Filter
Part # ICCEM3320
ICCEM3320
Click Photo to Enlarge

This discontinued, four-pole filter chip can be connected to provide a variety of responses such as low pass, high pass and band pass.

Its cutoff-frequency is voltage controllable over a ten octave range.  Voltage controlled resonance is also provided.

ITEM #:  IC-CEM3320
FUNCTION: Voltage Controlled Filter
PACKAGE: 18-Pin DIP
MANUFACTURER: Curtis Electromusic Specialties
DATA SHEET: CEM3320 Data Sheet
NOTES: May be New Old Stock or Used (pulled from socket, tested)

PRICE - $110 USD


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Vintage synths using the CEM3320:

CRUMAR®
Trilogy Composer  
DIGISOUND
80-6 VCF 80-7A VC SVF  
DOEPFER®
A121 MMF A122 LPF A123 HPF
ELKA
Synthex    
FAIRLIGHT
CMI II    
FORAT
F9000    
LINN
Linndrum Linn 9000  
OBERHEIM
OB-8 OBX-a OB-SX
PAiA Electronics
Proteus    
PPG
Wave 2.0    
SEQUENTIAL CIRCUITS
Prophet 5 Rev 3 Prophet 10 Pro-1
Drumtraks    
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CEM3340  —  Voltage Controlled Oscillator
Part # ICCEM3340
ICCEM3340
Click Photo to Enlarge

This discontinued VCO outputs a triange, a sawtooth, and a square or pulse wave simultaneously.

It's used in many vintage synths, including models made by Sequential Circuits, Oberheim, and Moog.

ITEM #:  IC-CEM3340
FUNCTION: Voltage Controlled Oscillator (VCO)
PACKAGE: 16-Pin DIP
MANUFACTURER: Curtis Electromusic Specialties
DATA SHEET: CEM3340 Data Sheet
NOTES: May be New Old Stock or Used (pulled from socket, tested)

PRICE - $110 USD

Note:  There is a limit of one CEM3340 IC per customer.

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Vintage synths using the CEM3340:

CRUMAR®
Spirit    
DIGISOUND
80-2 VCO 80-3 VC LFO 80-C9 Voice Card
DOEPFER®
A-111-1 VCO    
EEH (SSB)
Syntec Banana    
MOOG®
Memorymoog    
OBERHEIM
OB-8 OBX-a OB-SX
PAiA Electronics
Proteus    
ROLAND®
SH-101 MC-202 Jupiter 6
Jupiter 8 (later models) MKS-80  
SEQUENTIAL CIRCUITS
Prophet 5 Rev 3 Prophet 10 Prophet 600
Prophet T8 Pro-1  
SIMMONS DRUMS
SDS7    
STEINER PARKER
EVI    
SYNTON
Syrinx SN1    
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RC4136N  —  Quad Op Amp
Part # ICRC4136N
ICRC4136N
Click Photo to Enlarge

Each of the four op amps in the RC4136 is electrically similar to the industry standard 741 op amp.  Except the 4136 has no offset-null pins.

A high input voltage range and the absence of latch-up make this chip ideal for voltage-follower applications.

The 4136 quad op amp has a non-standard pin-out, making substitute types hard to find.

ITEM #:  IC-RC4136N
FUNCTION: Quad Operational Amplifier
PACKAGE: 14-Pin DIP
MANUFACTURER: Texas Instruments
DATA SHEET: RC4136 Data Sheet
NOTES: New Old Stock

PRICE - Package of 3 chips for $7.98 USD


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SSM2056  —  Envelope Generator
Part # ICSSM2056
ICSSM2056
Click Photo to Enlarge

This discontinued IC generates a four-stage sound envelope (Attack Time, Decay Time, Sustain Level, and Release Time) in response to four analog input voltages plus a trigger and a gate.

Synths using the SSM2056:

GEM
H-3000 PK-4900  
HOHNER®
Symphonie
D94, D96, D98
GP-98 Vox-4
KORG®
Poly-61 & 61-M Polysix Trident
SEQUENTIAL CIRCUITS
Velocity 6    
SIEL
DK-600 DK-700 Opera-6
Kiwi Expander  
SOLTON
SM-100    
ITEM #:  IC-SSM2056
FUNCTION: Voltage Controlled Envelope (Transient) Generator  (ADSR)
PACKAGE: 14-Pin DIP
MANUFACTURER: Solid State Micro Technology for Music, Inc.
DATA SHEET: SSM-2056 Data Sheet
NOTES: May be New Old Stock or Used (pulled from socket, tested)

PRICE - $45 USD


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TDA0470-D  —  Organ Gate
Part # ICTDA0470D
ICTDA0470D
Click Photo to Enlarge

The TDA0470-D is an improved, pin compatible version of the TDA 0470 12-Transistor Array and is particularly suitable for use in electronic organs.

Its 12 parallel transistors each replace a mechanical key contact, making it possible to reduce the number of mechanical contacts per key (there are up to 10 in a standard organ) to a single mechanical contact per key.

Each of the twelve emitters is fed by its own tone signal and their sum is available at the common collector pin.

ITEM #:  IC-TDA0470D
FUNCTION: 12-Transistor Array,
Organ Gate
PACKAGE: 14-Pin DIP
MANUFACTURER: ITT Corporation
DATA SHEET: TDA0470D Data Sheet
NOTES: Used, working, unsoldered from board

PRICE - $27 USD


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The TDA0470-D uses clamping diodes on the emitter inputs to reduce capacitive crosstalk among the transistors.


Vintage keyboards using the TDA0470-D:

ARMON®
K-300 P-300  
ARP
Omni Omni 2 Quadra
Solus String Ensemble  
CRB
Diamond 702 Diamond 706 Diamond 707
Diamond 709 Diamond 720-L Diamond 721-L
CRUMAR
920 2002 Accoder N (Fisa Accoder)
  Organizer T-1 Organizer T-2
ELKA
Concorde 402 Concorde 602 X-605
FARFISA
251/252 255/257 259
5230 5240 5250
6290 CH-32 Doria
Pergamon Professional 88 Professional 110
Soundmaker Syntaccordion Syntorchestra
  Syntorchestra 4  
HOHNER
  Vox II  
JEN
  Carousel C-450  
SOLINA
  String Ensemble  
VISCOUNT
Domus 4 Domus 5  
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