How does the assembly work?
As can be seen from the wiring diagram, the assembly consists of a CBA (stable tilting circuit) made with transistors T1 and T2, the "circuit breaker" made with FT, T3 and the control circuit, made with transistor T4.
To understand the operation of this vintage DIY electronic kit, we assume that it is powered and the phototransistor is placed in a place where a sufficient amount of light is received.
Under these conditions, the FT phototransistor controls the opening of T3 which blocks T2 and T4, so the assembly is in the "standby" state. When the brightness decreases, FT blocks the transistor T3, leading to the unlocking of T2 and T4.
By unlocking T2, the stable tilting circuit formed with T1 and T2, oscillates on a low frequency, thus controlling through T4 the bulb L or the relay Rel.
- Supply voltage: between 3V and 12V
- Frequency of "palpation": between 0.1 and 2Hz
- Standby consumption (for Ec = 12V): max. 1mA
- Maximum current in the output circuit: 0.5A
List of required components (with recent equivalents):
- D1 - EFD diode 108 or 1N34A
- D2 - Diode BR1 or 1N4007
- T1, T2, T3 - SNC1 transistors (BC 170 - 174) or BC 337
- T4 - transistor SPD1 (BD 136 - 140)
- FT - phototransistor SNC-3F or QSE113 / TEMT1000 / QSB363ZR
- R1 - resistance 39 KOhm
- R2 - resistance 330 KOhm
- R3 - resistance 180 KOhm
- R4 - resistance 1.5 KOhm
- R5 - resistance 390 Ohm
- C1 - capacitor 10uF / 40V
- C2 - 2.2uF / 63V or 1.5uF / 100V capacitor
- C3 - 100uF / 16V or 150uF / 16V capacitor
- Lamp and relay (both the L bulb and the relay used will be correlated with the supply voltage of the assembly)
Download the original IPRS leaflet Baneasa 8604
Symbols of original components used:
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:
Many of you are probably wondering how this DIY electronic kit was packaged or distributed. Below I have attached a picture with the packaged product (new). Thanks sir. Marius Balauta!
I have attached below two images with assembled assembly. Thank you Mr. George-Alexandru Marinescu for providing the pictures and for the support given to the ELECTROKITS.RO community