CES-313 Audio Transformer Module

Have a duplicate.

CES-304 FM Communications Module

Has Bananas. The XTAL broke off.

CES-306 Power Transformer Module

Weighs a lot. I have a duplicate.

CES-342 Display/Input

CES-343 A/D Converter

CDS cell facing the floor in the lower left.
motorola sn74ls75n 4-bit d-latch
ADC0804LCN Intersil 8-Bit A/D Converters

CES-349 Timing/Counter System

TI sn74l47n BCD-toSeven Segment Decoder Driver X2
National DM74LS93N Decade And Binary Counters X2
National DM74LS73N Dual j-k master-slave flip-flop with clear
National DM74LS08N - Quad 2-Input AND Gates
National LM555CN - timer

C.E.S. Ed-Lab Superhet Card

C.E.S. Ed-Lab breadboard card

For Ed-Labs with card slots. I have a few of these to trade.


Maestro Rhythm 'N Sound G-2


Complex Waveform Generator

not just any model but the Exact Model 202
thanks to Bubblesound

Variable Diode Function Generator

Comdyna 709


How to Echorec a Nice Beach



Do not use LIGHTNING near water; do not take LIGHTNING into your bath, sauna or hot tub. Take care not to spill liquids into LIGHTNING.

Exercise close supervision when using LIGHTNING near children.


Comdyna GP-6 Analog Computer

Jitter and Hit Synthesizer Model 2A

An iconic record label was once rumored to have spent a small fortune for one of these. Turn it on, crank it up and out comes a hit... or maybe just a jitter.

Frequency Translation and Harmonic Distortion Module


Roland EP-30

I was trying to ID the keyboard -- Thanks to K/Modeless Factory for the ID.





CES Ed-Lab 650?

This 1982 Ed-Lab doesn't have a model number or name at the top. It seems like it might be a 650 based on what's on a 651.


CES Ed-Lab 702 Digital Systems Lab

This one has a speaker on the back face for a boombox feel. It seems to be a newer version of the 700 with added keypad and LED digits and no meter.


CES Ed-Lab 700 Computer Systems Lab

Notice all the multiple jacks! I was surprised to see any multiples on a banana jack system. I think a lot of the stock banana cables supplied with these systems were sort of economic and don't stack. There could be some potential educational clarity to using a multiple, but it seems sort of against the philosophy of banana patching.

10 Flip Flops - (chip: 945 PC F)
4 four input AND gates (1806 PC F)
3 four input NAND gates (SW 962-2P 1342)
3 four input NOR gates (1810 PC F)
2 four and 1x 3 input OR gates (Motorola MC1808P)
4 four input XOR gates (SW1812-M)
5 logic Inverters (motorola MC837P)
2 pots
2 resistors
3 2N5172
1 One Shot
1 Follower Hold
1 Schmitt Trigger
1 Clock (hi or low speed with regular and inverse output)
1 four input threshold logic
1 4-Bit DA converter
1 Comparator op-amp
3 diodes
5 LEDs
5 Switch
1 momentary contact switch
10 multiples.
1 Voltage source


Ampere Meter


Comdyna GP-10 Analogue Computer

This was likely pulled from a larger Comdyna 7000 Analog/Hybrid Computing System. The GP-10/S is still available from the manufacturer.

CES Ed-Lab 900 Digital Memory & Display Lab

Digital Memory & Display Lab

CES Ed-Lab 651.A Electronic Systems Lab

Electronics Trainer dated 1989, this photo was reused by sion10 on ebay without permission to try sell his different model at a very hefty price.


yes I have bananas

The Logic Lab just talked about did indeed use miniature banana jacks. In my quest for the elusive connector I wound up mistakenly buying a bunch of small full size banana plugs seen here. They weren't suitable.

I'm building some cables with miniature banana plugs right now. Actual Mini Bananas have a 3.05mm diameter vs. 4.3mm? diameter full size Bananas.


Tektron Logic Lab

Does anyone know what the patch plug connctors that go with these jacks are called?

Update: mini-banana plugs.