What it is?
This vintage DIY electronic kit is a light organ with 3 projectors (bulbs), with the light effects rate adjustable by a rotary knob. The bulbs will light up depending on the intensity of the input signal and its frequency, producing special lighting effects.
How does the circuit work?
The wiring diagram comprises four parts: a preamplifier, a medium frequency separator stage, a low frequency separator stage and a low frequency separator stage. Each part of the electronic scheme is described in detail in the following:
- The preamplifier composed of transistors T1 and T2, has the role of amplifying the signal taken from a radio (output from detection)
- The low frequency separator stage consists of a "low pass" filter (R5, R6, C5, C6) and an amplification stage (T3, T4)
- Medium frequency separator stage, consisting of a "bandpass" filter (C8, R10, R11, R12, C9) and an amplification stage (T6, T7)
- High frequency separator stage, consisting of a "pass up" filter (C11, R16, R17) and an amplification stage (T9, T10)
In the collectors of transistors T7, T8, T11 the electric lamps are connected as follows:
The red light bulb at T5, the yellow light bulb at T8 and the green light bulb at T11 (of course you can use any color you want). With an audio frequency signal from the radio, cassette player, pick-up, mp3, PC, laptop (from the line output: 500mV) you can act directly from point A, breaking the ab connection. The light intensity of the bulbs and their operating dynamics are adjusted with the help of the P potentiometer (5 KOhmi). The assembly is powered by a 9V battery or DC voltage source.
The red light bulb at T5, the yellow light bulb at T8 and the green light bulb at T11 (of course you can use any color you want). With an audio frequency signal from the radio, cassette player, pick-up, mp3, PC, laptop (from the line output: 500mV) you can act directly from point A, breaking the ab connection. The light intensity of the bulbs and their operating dynamics are adjusted with the help of the P potentiometer (5 KOhmi). The assembly is powered by a 9V battery or DC voltage source.
Technical characteristics of the assembly
- Supply voltage: 9V
- Maximum current consumption: 300mA
- Input sensitivity: approx. 20mV
- Input impedance: approx. 100 KOhm
- Electric bulbs: 75mA / 9V
- Frequency band in which the filters work:
- Channel I (low frequencies): 50 - 500Hz
- Channel II (medium frequencies): 500 - 2000Hz
- Channel III (high frequencies): 2000 - 16000Hz
This vintage DIY electronic kit came with a set of polystyrene boards and a soldering solution (toluene). With their help, the box in which the electric lamps and the electronic assembly are subsequently mounted is made. With a metal or wood object, the soldering solution was spread in a thin layer on the edges to be glued, after which the plates were placed according to the drawing in the leaflet. For proper gluing of the box, it must be left to dry for 24 hours.
List of required components (with recent equivalents):
- T1, T3, T4, T6, T7, T9, T10 - BSNC 1 transistors (BC 170) or BC 337 / 2N2222
- T2 - transistor BC 170 C or BC 337 / 2N2222
- T5, T8, T11 - BSND 1 transistors (BD 135, BD 233) or BD 137 / BD 139
- Cl - capacitor - 0,22 uF / 10V min.
- C3 - capacitor - 4,7 uF / 10V min.
- C2, C9 - capacitors - 47 nF / 10V min.
- C8 - capacitor - 0,1 uF / 10V min.
- C11 - capacitor - 1,5 nF / 10V min.
- C6 - capacitor - 0,47 uF / 10V min.
- C4, C5, C7, C10, C12 - capacitors - 10uF / 10V min.
- R1 - resistor - 1 MOhm / 0,125W min.
- R3 - resistor - 330 KOhm / 0,125W min.
- R2, R4, R9, R12, R15, R20 - resistors - 1 KOhm / 0,125W min. or 1.2 KOhm / 0,25W
- R5, R8, R11, R14, R19 - resistors - 2,2 KOhm / 0,125W min.
- R6 - resistor - 22 KOhm / 0,125W min.
- R7, R13, R18 - resistors - 10 KOhm / 0,125W min.
- R10 - resistor 680 Ohm / 0,125W min
- R16 - resistor 150 KOhm / 0,125W min.
- R17 - resistor 4,7 KOhm / 0,125W min.
- Semi-adjustable linear - 5 KOhm
- Electric bulbs: 75mA / 9V (3. pcs) -> See here how to replace the original 9V / 75mA bulbs, ie approx. 4W with a group of LEDs.
- Printed wiring or breadboard test board
- Tin or connecting threads
Download the original IPRS leaflet Baneasa 8202
For a better understanding of the operation of the circuit we will need electronic scheme presented below:
In order to carry out this project in our own laboratory, we will also need printed wiring PCB layout From lower:
This electronic kit has often been used by innovative amateur electronics designers to design modified light organs. Thus, almost every electronics engineer at that time (since 1983) used this kit as a base in construction of improved light organs (modified).
I have attached below an image with an improved light organ, which uses this electronic kit as a basic assembly:
Many of you are probably wondering how this DIY electronic kit was packaged or distributed. Below I have attached some pictures with the packaged product (new), the contents of the envelope and two pictures with the assembled product. Thanks Mr. Marius Balauta and also Mr. George-Alexandru Marinescu for providing pictures!
Another example of Modified "light organ", we have it below, where in the box were crammed a small transformer, a rectifier bridge, three thyristors, three potentiometers for each channel, plus a general potentiometer and obviously the kit presented. The project was carried out in 1984 by Mister. My Daniel.
sources:
https://www.arduinotehniq.com/
Video with the operation of the "Miniorga de lumini" kit - Prospect 8202
Mini-MORGA of lights. I buried 200 communist lei.
For that installation, I pinched 100 lei from my father because my own savings were not enough. At 200 lei it seemed impossible to obtain this installation. I assembled it with a great appetite and I seem to remember that I powered it at 9V. But unfortunately it didn't work for me. A channel stayed on and that's about it. I tried with a signal on a DIN cable and a signal from a speaker. I failed to assemble the box. That adhesive in the bottle did not harden even after 24 hours… Today I have it in the collection, unassembled, and a mounted copy that works.
I understand that it was quite expensive at the time… but I still think it brought a lot of satisfaction.
Most of the ones you presented I did. They were expensive but worth it. The last one I bought for 250 lei was a mounting on the plate with clamps. He had a ringer and I don't know what he had. It was interesting that the radio was catching many stations. All transistors were marked. I also bought the intercom from the bookstore.
I was a high school student in grades 9-10 when I made the first kits so I took the cheapest ones. But I had the Russian radio with the black plastic case that caught a few stations on medium waves.
Made in '84, it still works, with many improvements (thyristors for 220v bulbs, potentiometers on each channel, transformer + power supply bridge).
I was in high school ... if I had access to parts and materials today, it would have been even better. In addition to the thyristors and the basic kit, we designed it from recovered components.
I don't know if I had the box anymore but I put it in a plywood box I made.
Super! Adapted to thyristors, it was the only play of lights at the high school disco.
The organ of lights was in vogue in those '80s. But there is a big problem. You would find those thyristors quite difficult if "someone" doesn't help you, I don't even remember triacs anymore.
That's what I had. And then I modified it and used 220v bulbs. But I don't remember if I did it with thyristors or with the trafficking of frames from TVs to lamps.
I also found the modification scheme somewhere in Tehnium. It's like canceling the output transistor, adding a 3055 and transforming frames. The finished product worked very well.
I noticed and appreciate that someone takes care of beginners by offering them simple schemes, easy to make and very attractive. But especially presented very well, of course! Respect!
I also made a light organ in 1984, using LC filters. I don't remember where I got the scheme from. I painted the bulbs with pen paste and thinner, the blue came out bad; for this organ of lights, I was invited to almost all the parties that were given by my friends or I was recommended.
IPRS Baneasa was the start for many enthusiasts. While mounting, and learning. Too bad there is no such thing today.
You are very right! You had the circuit board and all the parts, complete and understandable explanations… even a piece of fludor was in the box!
Can they be replaced by the bulbs that some LEDs have?
Yes, see the instructions in the article in the "List of required components (with recent equivalents)" section.
Many of us have created a horizon, a profession with the help of these kits. How much praise, what cocks we show in front of the girls with my 'new electro montage' ..
I was asking a neighbor to drill my wiring for him at work, hey! how many people were engaged in my assemblies, locksmith, carpenter ... Beautiful moments!
I bought most of the kits from IPRS at the time.
The light organ worked for me, but I made one with digital filters, because I had caught the taste of logic integrated circuits (CDB TTLs).
Beautiful times…