6
\$\begingroup\$

Can you please help me identity these symbols from a vintage (1960) diagram? The capacitors units are noted with "KP", sometimes just "K". What is the rectangle crossed with an arrow? It looks like a potentiometer without the tap connected.

1.what does kp means? pico farad?

Capacitor with "680 kp"

2. what is this symbol? 5/6?

Capacitor with the broad terminal partially clamping the short one; unit "5/6"

3. 47K farad?

Capacitor with "47 K"

4. 22k resistor or diode or bias pot?

Resistor or pot or even a diode?

The full circuit: Full circuit (source)

\$\endgroup\$
  • 1
    \$\begingroup\$ 47K farad? ... no. :) \$\endgroup\$ – pipe Oct 2 '16 at 18:21
  • 3
    \$\begingroup\$ 680 kilo-pico farads? \$\endgroup\$ – Armandas Oct 2 '16 at 18:25
  • 4
    \$\begingroup\$ Likely 47000pf = 47nf and 680 nf. The arrows indicate potentiometers or variable resistors (use a pot, connect the wiper to one end). The other one looks like an electrolytic capacitor but "5/6" makes no sense as a value - is it perhaps the 5th section of a 6-section capacitor? (Packing several high voltage caps into one can used to be common, in the pre-transistor days). The full circuit may give enough context for a better guess. \$\endgroup\$ – Brian Drummond Oct 2 '16 at 18:26
  • 2
    \$\begingroup\$ Compare the 5uF/6Vdc at the input to the 5uF/12Vdc at the output. The voltage requirement at the output collector is somewhat higher than at the input... \$\endgroup\$ – Maxjoha Oct 2 '16 at 23:12
  • 2
    \$\begingroup\$ Seeing the circuit, yes the electrolytics are 5uF/6V and 12V, from the days when 12V electrolytics were larger and more expensive than 6V ones. As for the shape? The negative terminal is usually the outer can. \$\endgroup\$ – Brian Drummond Oct 3 '16 at 12:15
1
\$\begingroup\$
  1. capacitor 680 kilo-pico-Farad (kpF) same as 680nF
  2. Capacitor 5uF 6Volt.
  3. 100k ohm potentiometer
  4. 22k ohm trimer potentiometer

All capacitors marked k are in kpF which is the same as nF The line inside the resistors means that those are thin film resistors either carbon or metal.

This is a NPN BJT based circuit, GND is connected to the positive of the battery and negative terminal is marked + but GND should be negative despite teh battery symbol being wrong.

\$\endgroup\$
  • 1
    \$\begingroup\$ 1) Electrolytic cap: I agree about the value of 5uF / 6V but the small terminal should be positive; the large terminal should be negative. 2) Transistors appear to be NPN. Google also thinks that the transistors are NPN. 3) There is a really good chance that the capacitor marked "680kp" is 680nF Polystyrene (low leakage and very stable). – Dwayne Reid 7 hours ago \$\endgroup\$ – Dwayne Reid Mar 9 '17 at 14:51
  • \$\begingroup\$ Yes you are right, I have updated the answer. \$\endgroup\$ – 555 Mar 9 '17 at 14:57
  • \$\begingroup\$ I think the + sign is on the right side but the battery is upside down. \$\endgroup\$ – Oskar Skog Mar 9 '17 at 15:39
  • \$\begingroup\$ That is correct, the thin and long line in the battery symbol is the plus terminal, but the symbol is upside down \$\endgroup\$ – 555 Mar 10 '17 at 22:17

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.