Does anyone know where to find a SN76488N IC? This is a 28-pin sound effects generator chip used in some circuits in the book "33 Electronic Music Projects You Can Build" (Winston, Lawrence E., Tab Books, 1981, ISBN 0-8306-1373-0) on p. 144-154.
From the book:
The SN76488N complex sound generator is an integrated circuit which combines both linear and digital circuitry. Shown in Fig. 7-26, this IC lends itself very well to music applications. It will generate special-effect noises, tones, and low frequency sounds. You can create a wide variety of sounds using many different types of electronic components. Projects using this can include home video games, toys, alarms, and complex electronic musical instruments. It is available from your local Radio Shack store for less than $7.00. This makes it a very excellent buy. The SN76488N integrated circuit contains its own internal audio amplifier circuit which will directly drive an 8-ohm speaker through a 100 microfarad capacitor.
From some old newsgroup posts:
> 2) Texas Instruments
> SN76488N
> Singapore 8035A
> 26 Pin DIP
> Again, you must ignore the SN prefix which is specific to TI.
^ I think they made an error, according to the book the chip has 28 pins.
I'm going to start working on a sound generator for a locomotive
> sometime soon, and I was wondering if any of you have used Radio
> Shack SN76488N (part 276-1766) in a project and if it is still available?
Is this chip obsolete? Are there any equivalents or replacements currently available?
Thanks...
PS The pinout is diagrammed as follows:
1 One-Shot Output
2 VCO Output
3 Noise Clock Output
4 SLF Output
5 Noise Resistor
6 Noise Capacitor
7 Decay Resistor
8 Decay Capacitor
9 Inhibit
10 Audio Input
11 VReg 5-Volt Out
12 VCC
13 Audio Output
14 Ground
15 VCO External Control
16 VCO Capacitor
17 VCO Resistor
18 SLF Resistor
19 SLF Capacitor
20 VCO Select
21 One-Shot Capacitor
22 One-Shot Resistor
23 Mixer C Input
24 Mixer A Input
25 Mixer B Input
26 SLF Select
27 Envelope Select 2
28 Envelope Select 1