Hi all,
Are there some Lectron users in this forum ?
If so, it would be cool to add some circuits here made with the legacy modules (positive ground)
Lately, I stumbled across a neat oscillator circuit on the www and decided to build it with the Lectron system.
The meter is only for indication of the voltage swings.
When the 10µF capacitor is used, the lamp shows nicely the output waveform.
What kind of waveform do you think it produces ?
Many greetings
Hallo alle,
Gibt es in diesem Forum einige Lectron-Benutzer?
Wenn ja, wäre es cool, hier einige Schaltkreise hinzuzufügen, die mit den alten Modulen (positive Masse) hergestellt wurden.
Kürzlich bin ich im WWW auf eine hübsche Oszillatorschaltung gestoßen und habe beschlossen, sie mit dem Lectron-System zu bauen.
Das Messgerät dient nur zur Anzeige der Spannungsschwankungen.
Wenn der 10µF-Kondensator verwendet wird, zeigt die Lampe die Ausgangswellenform gut an.
Was für eine Wellenform erzeugt es Ihrer Meinung nach?
Viele Grüße
Lectron retro setup : Transistor oscillator
Moderator: suntri
Lectron retro setup : Transistor oscillator
“All the electronic devices are powered by white smoke. When smoke goes out, device is dead.”
― Milan Nikolic
― Milan Nikolic
Re: Lectron retro setup : Transistor oscillator
Hallo,
was mir auffällt ist, sind die Basiswiderstände, die bei jedem Transistor einen anderen Wert haben. Zusätzlich ist bei T1 angedeutet, dass das Gehäuse auf Masse liegt, was m. E. auf einen HF-fähigen Transistor hindeutet.
- Sind die Transistoren aus verschiedenen Jahrgängen (anderer Transistortyp mit angepasstem Widerstand)?
- Oder wurden die Transistoren in einem Kasten ausgeliefert? Wenn ja, welchen Sinn hatte das?
Kennt sich da jemand mit den alten Lectron-Kästen aus?
Gruß
Wolfgang
was mir auffällt ist, sind die Basiswiderstände, die bei jedem Transistor einen anderen Wert haben. Zusätzlich ist bei T1 angedeutet, dass das Gehäuse auf Masse liegt, was m. E. auf einen HF-fähigen Transistor hindeutet.
- Sind die Transistoren aus verschiedenen Jahrgängen (anderer Transistortyp mit angepasstem Widerstand)?
- Oder wurden die Transistoren in einem Kasten ausgeliefert? Wenn ja, welchen Sinn hatte das?
Kennt sich da jemand mit den alten Lectron-Kästen aus?
Gruß
Wolfgang
Re: Lectron retro setup : Transistor oscillator
Hello Wolfgang,
In the Lectron era, the PNP transistors were AC151 (Audio amplification) and AF125 (HF stage).
When Braun took over, the AC151 was replaced with AC125, the AF125 was retained.
Those types for the Ge transistors were used throughout the years until recently.
The AC125 transistor with 100k Base resistor was mainly used as speaker or lamp driver as it needed a bit more Base current.
The AC125 transistor with 330k Base resistor was used in circuits with lower Collector currents, such as preamplifier.
The AF125 was used as HF stage in radio circuits (it has very low gain but was better suited for HF amplification).
The 100k, 330k and 680k Base resistor set the bias for each transistor purpose.
Of course, we can use this transistor for audio, oscillator or switching too but Collector current must be low.
The resistors build in saved precious space on the mounting boards.
We can take advantage of these resistors as shown in followed circuit where we use the transistor in Emitter follower mode to charge a capacitor.
The 330k resistor charges the capacitor slowly.
By using the transistor with the 100k Base resistor, the charging happens faster.
Many greetings
In the Lectron era, the PNP transistors were AC151 (Audio amplification) and AF125 (HF stage).
When Braun took over, the AC151 was replaced with AC125, the AF125 was retained.
Those types for the Ge transistors were used throughout the years until recently.
The AC125 transistor with 100k Base resistor was mainly used as speaker or lamp driver as it needed a bit more Base current.
The AC125 transistor with 330k Base resistor was used in circuits with lower Collector currents, such as preamplifier.
The AF125 was used as HF stage in radio circuits (it has very low gain but was better suited for HF amplification).
The 100k, 330k and 680k Base resistor set the bias for each transistor purpose.
Of course, we can use this transistor for audio, oscillator or switching too but Collector current must be low.
The resistors build in saved precious space on the mounting boards.
We can take advantage of these resistors as shown in followed circuit where we use the transistor in Emitter follower mode to charge a capacitor.
The 330k resistor charges the capacitor slowly.
By using the transistor with the 100k Base resistor, the charging happens faster.
Many greetings
“All the electronic devices are powered by white smoke. When smoke goes out, device is dead.”
― Milan Nikolic
― Milan Nikolic